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Perineum
The area between the anus and the scrotum in the male and between the anus and the vulva (the labial opening to the vagina) in the female. An episiotomy is a surgical ...
perineural
Surrounding a nerve. [peri- + G. neuron, nerve]
perineurial
Relating to the perineurium.
perineuritis
Inflammation of the perineurium. SEE ALSO: adventitial neuritis.
perineurium
One of the supporting structures of peripheral nerve trunks, consisting of layers of flattened cells and collagenous connective tissue, which surround the nerve fasciculi and ...
perinuclear
Surrounding a nucleus. SYN: circumnuclear.
periocular
SYN: circumocular.
period
1. A certain duration or division of time. 2. One of the stages of a disease, e.g., p. of incubation, p. of convalescence. SEE ALSO: stage, phase. 3. Colloquialism for menses. ...
Period, gestation
The period of development of the young from the time of conception until birth. For humans the full gestation period is normally 9 months. The word "gestation" comes from the ...
Period, incubation
In medicine, the time from the moment of exposure to an infectious agent until signs and symptoms of the disease appear. For example, the incubation period of chickenpox is ...
periodate
A salt of periodic acid.
periodic
1. Recurring at regular intervals. 2. Denoting a disease with regularly recurring exacerbations or paroxysms. 3. Denoting any of several oxoacids of iodine.
Periodic abstinence
Also known as fertility awareness, natural family planning, and the rhythm method, this approach entails not having sexual intercourse on the days of a woman's menstrual ...
periodic acid
1. HIO4, but existing in solution usually in hydrated form; used in carbohydrate detection and analysis. SYN: metaperiodic acid. 2. Any of several iodic(VII) acids formed by ...
Periodic breathing
Clusters of breaths separated by intervals of apnea (no breathing) or near-apnea. As opposed to normal breathing which is usually regular. Periodic breathing was originally ...
Periodic fever
Recurrences of fever that last from a few days to a few weeks and are separated by symptom-free intervals of varying duration. This pattern of fever can be caused by recurrent ...
periodicity
Tendency to recurrence at regular intervals. - diurnal p. a circadian rhythm with primary expression of the p. during daylight hours, as in the release of microfilariae of Loa ...
Periodontal
The word "periodontal" literally means "around the tooth." Periodontal diseases are bacterial infections that destroy the attachment fibers and supporting bone that hold the teeth ...
Periodontal disease
A bacterial infection that destroys the attachment fibers and supporting bone that hold the teeth in the mouth. Left untreated, these diseases can lead to tooth loss. The main ...
Periodontal Disease Index
An index used for estimating the degree of periodontal disease based on the measurement of six representative teeth for gingival inflammation, pocket depth, calculus and ...
Periodontal Index
An index for the epidemiologic classification of periodontal disease.
periodontia
1. Plural of periodontium. 2. SYN: periodontics.
Periodontics
Periodontics is the branch of dentistry concerned with the prevention, diagnosis and treatment of diseases affecting the gums and supporting structures of the teeth. Periodontists ...
periodontist
A dentist who specializes in periodontics.
Periodontitis
Gum disease. The word "periodontitis" literally means "inflammation around the tooth." Periodontitis and all periodontal diseases are bacterial infections that destroy the ...
periodontium
The connective tissue that surrounds the tooth root and attaches it to its bony socket; it consists of fibers anchored in the cementum and extending into the alveolar bone; the ...
periodontoclasia
Destruction of periodontal tissues, gingiva, pericementum, alveolar bone, and cementum. SYN: periodontolysis. [ periodontium + klasis, breaking]
periodontolysis
SYN: periodontoclasia. [ periodontium + G. lysis, dissolution]
periodontosis
SYN: juvenile periodontitis. [ periodontium + G. -osis, condition]
periomphalic
SYN: periumbilical. [peri- + G. omphalos, umbilicus]
Perionychia
An inflammation of the folds of tissue surrounding the nail due to infection. The infection may be bacterial (most commonly, staph or strep) or to fungal. "Perionychia" is ...
Perionychium
The tissue surrounding the nail, whether it be a fingernail or a toenail, including the tissue bordering the root and sides of the nail. The word is composed of "peri-" meaning ...
perionyx
Remnant of the eponychium remaining in the narrow fold overlapping the proximal part of the lunula found beginning in the eighth month of pregancy and remaining throughout ...
perioophoritis
Inflammation of the peritoneal covering of the ovary. SYN: periovaritis. [peri- + Mod. L. oophoron, ovary, + -itis, inflammation]
perioophorosalpingitis
Inflammation of the peritoneum and other tissues around the ovary and oviduct. SYN: perisalpingoovaritis. [peri- + Mod. L. oophoron, ovary, + salpinx, trumpet, + -itis, ...
perioperative
Around the time of operation. SYN: paraoperative.
periophthalmic
SYN: circumocular. [peri- + G. ophthalmos, eye]
periophthalmitis
Inflammation of the tissues surrounding the eye.
perioral
Around the mouth. SYN: circumoral, peristomal, peristomatous.
periorbit
SYN: periorbita.
periorbita
The periosteum of the orbit. SYN: periorbit, periorbital membrane. [peri- + L. orbita, orbit]
periorbital
1. Relating to the periorbita. 2. SYN: circumorbital.
periorchitis
Inflammation of the tunica vaginalis testis. [peri- + G. orchis, testis, + -itis, inflammation] - p. hemorrhagica chronic hematocele of the tunica vaginalis testis.
periost
SYN: periosteum.
periostea
Plural of periosteum.
Periosteal
Pertaining to the periosteum, a dense membrane composed of fibrous connective tissue that closely wraps (invests) all bone, except the bone of articulating surfaces in joints ...
periosteitis
SYN: periostitis.
periosteo-
The periosteum. [Mod. L. periosteum]
Periosteoma
A benign tumor arising from the periosteum, the dense membrane composed of fibrous connective tissue that closely wraps (invests) all bone (except the articular surfaces of bone ...
periosteomedullitis
SYN: periosteomyelitis. [ periosteo- + L. medulla, marrow, + G. -itis, inflammation]
periosteomyelitis
Inflammation of the entire bone, with the periosteum and marrow. SYN: periosteomedullitis. [ periosteo- + G. myelos, marrow, + -itis, inflammation]
periosteopathy
Any disease of the periosteum.
periosteophyte
SYN: periosteoma. [ periosteo- + G. phyton, growth]
periosteosis
The formation of a periosteoma. SYN: periostosis.
periosteotome
A strong scalpel-shaped knife, for cutting the periosteum. SYN: periostotome.
periosteotomy
The operation of cutting through the periosteum to the bone. SYN: periostotomy. [ periosteo- + G. tome, incision]
periosteous
SYN: periosteal.
Periosteum
The periosteum is a dense membrane composed of fibrous connective tissue that closely wraps (invests) all bone, except that of the articulating surfaces in joints which are ...
Periostitis
Inflammation of the periosteum, a dense membrane composed of fibrous connective tissue that closely wraps (invests) all bone, except the bone of articulating surfaces in joints ...
Periostoma
A benign tumor arising from the periosteum, the dense membrane composed of fibrous connective tissue that closely wraps (invests) all bone (except the articular surfaces of bone ...
periostosis
SYN: periosteosis.
periostosteitis
Inflammation of a bone with involvement of the periosteum. [ periosteum + G. osteon, bone, + -itis, inflammation]
periostotome
SYN: periosteotome.
periostotomy
SYN: periosteotomy.
periotic
Surrounding the internal ear; referring to the petrous portion of the temporal bone, or the spaces and tissues in the bony labyrinth that surround the membranous labyrinth. ...
periovaritis
SYN: perioophoritis.
periovular
Surrounding the ovum.
peripachymeningitis
Inflammation of the area between the dura and bony covering of the central nervous system. [peri- + pachymeninx (dura mater) + G. -itis, inflammation]
peripancreatitis
Inflammation of the peritoneal coat of the pancreas.
peripapillary
Surrounding a papilla.
peripatetic
Walking around; formerly used to describe a patient with “walking” (i.e., mild) typhoid fever. [G. peripatesis, a walking about]
peripenial
Surrounding the penis.
peripharyngeal
Surrounding the pharynx.
peripherad
In a direction toward the periphery. [G. periphereia, periphery, + L. ad, to]
Peripheral
Situated away from the center, as opposed to centrally located. For example, peripheral vision means the type of vision that allows one to see objects that are not in the center ...
Peripheral blood stem cell transplantation
: A new technique in which stem cells are obtained from a patient's blood and used in bone marrow transplantation. Stem cells are small, round cells with a squat nucleus and scant ...
Peripheral nervous system (PNS)
That portion of the nervous system that is outside the brain and spinal cord. The peripheral nervous system (PNS) is one of the two major divisions of the nervous system. The ...
Peripheral neuropathy
A problem with the functioning of the nerves outside the spinal cord. Symptoms may include numbness, weakness, burning pain
Peripheral pulmonary stenosis with cholestasis
Also known as arteriohepatic dysplasia or Alagille syndrome, this ia a genetic disorder characterized by jaundice in the newborn period, liver disease with cholestasis, ...
Peripheral vision
Side vision; the ability to see objects and movement outside of the direct line of vision. In contrast to peripheral vision, central vision permits us to read, drive, and perform ...
peripheralis
SYN: peripheral, peripheral.
peripherin
A glycoprotein that apparently is needed to maintain the shape of the outer segment disk membranes of rods and cones; it is thought by many investigators that a defect in p. is ...
peripherocentral
Relating to both the periphery and the center of the body or any part.
periphery
1. The part of a body away from the center; the outer part or surface. 2. SYN: denture border. [G. periphereia, fr. peri, around, + phero, to carry]
periphlebitic
Relating to periphlebitis.
periphlebitis
Inflammation of the outer coat of a vein or of the tissues surrounding it. [peri- + G. phleps, vein, + -itis, inflammation]
Periplaneta
A genus of large cockroaches including several cosmopolitan household pests found wherever food is available, especially in moist protected areas. P. americana (American ...
periplasm
The space between the cell membranes and the cell wall, in Gram-negative bacteria; contains proteins secreted by the cell.
periplocin
A cardiotonic glycoside obtained from the bark and stems of Periploca graeca (family Asclepiadaceae), a plant of southern Europe. [G. peri-ploke, a winding around, fr. pleko, ...
peripolar
Surrounding the pole or poles of any body, or any electric or magnetic poles.
peripolesis
Penetration of migrating cells between fixed tissue cells that are normally in close contact. [peri- + G. poleomai, to wander]
periporitis
Miliary papules and papulovesicles with staphylococcic infection; most frequently on the face and in infants. [peri- + G. poros, pore, + -itis, inflammation]
periportal
Surrounding the portal vein. SYN: peripylic.
periproctic
SYN: circumanal. [peri- + G. proktos, anus]
periproctitis
Inflammation of the areolar tissue about the rectum. SYN: perirectitis.
periprostatic
Surrounding the prostate.
periprostatitis
Obsolete term for inflammation of the tissues surrounding the prostate.
peripylephlebitis
Inflammation of the tissues around the portal vein. [peri- + G. pyle, gate, + phleps, vein, + -itis, inflammation]
peripylic
SYN: periportal. [peri- + G. pyle, portal, gate]
peripyloric
Surrounding the pylorus.
perirectal
Surrounding the rectum.
perirectitis
SYN: periproctitis.
perirenal
SYN: perinephric. [peri- + L. ren, kidney]
perirhinal
Around the nose or nasal cavity. [peri- + G. rhis, nose]
perirhizoclasia
Inflammatory destruction of tissues immediately around the root of a tooth, i.e., pericementum, cementum, and approximating layers of alveolar bone. [peri- + G. rhiza, root, + ...
perisalpingitis
Inflammation of the peritoneum covering the fallopian tube. [peri- + G. salpinx, trumpet, + -itis, inflammation]
perisalpingoovaritis
SYN: perioophorosalpingitis. [peri- + G. salpinx, trumpet, + ovary + G. -itis, inflammation]
perisalpinx
The peritoneal covering of the uterine tube. [peri- + G. salpinx (salping-), trumpet]
periscopic
Denoting that which gives the ability to see objects to one side as well as in the direct axis of vision. [peri- + G. skopeo, to view]
perisigmoiditis
Inflammation of the connective tissues surrounding the sigmoid flexure, giving rise to symptoms, referable to the left iliac fossa, similar to those of perityphlitis in the ...
perisinuous
Surrounding a sinus, especially a sinus of the dura mater.
perispermatitis
Inflammation of the tissues around the spermatic cord. - p. serosa hydrocele of the spermatic cord.
perisplanchnic
Surrounding any viscus or viscera. SYN: perivisceral. [peri- + G. splanchna, viscera]
perisplanchnitis
Inflammation surrounding any viscus or viscera. [peri- + G. splanchna, viscera, + -itis, inflammation]
perisplenic
Around the spleen.
perisplenitis
Inflammation of the peritoneum covering the spleen.
perispondylic
SYN: perivertebral. [peri- + G. spondylos, vertebra]
perispondylitis
Inflammation of the tissues about a vertebra. [peri- + G. spondylos, vertebra, + -itis, inflammation]
Peristalsis
: The rippling motion of muscles in the digestive tract. In the stomach, this motion mixes food with gastric juices, turning it into a thin liquid. * * * The movement of the ...
peristaltic
Relating to peristalsis.
peristasis
Phases of inactivity of vasoconstriction in inflammation. SYN: peristatic hyperemia. [peri- + G. stasis, a standing still]
peristole
The tonic activity of the walls of the stomach whereby the organ contracts about its contents; contrasting with the peristaltic waves passing from the cardia toward the pylorus ...
peristolic
Relating to peristole.
peristoma
SYN: peristome.
peristome
A groove leading from the cytostome in ciliates and certain other forms of protozoa. SYN: peristoma. [peri- + G. stoma, mouth]
peristrumous
Situated about or near a goiter. [peri- + L. struma, goiter]
perisynovial
Around a synovial membrane.
perisystolic
Descriptive of events occurring before and after ventricular systole.
peritectomy
1. The removal of a paracorneal strip of the conjunctiva for the relief of corneal disease. 2. SYN: circumcision (2). [peri- + G. ektome, excision]
peritendineum
One of the fibrous sheaths surrounding the primary bundles of fibers in a tendon. [L. fr. peri- + G. tenon, tendon]
peritendinitis
Inflammation of the sheath of a tendon. SYN: peritenonitis, peritenontitis. - p. calcarea a calcium (chalky) deposit around a tendon. - p. serosa SYN: ganglion (2).
peritenon
SYN: tendinous sheath of extensor carpi ulnaris muscle. [peri- + G. tenon, tendon]
peritenontitis
SYN: peritendinitis.
perithecium
In fungi, a flask-shaped ascocarp, one of the many shapes of structures that bear asci and ascospores; useful as an aid in identifying a fungus. [peri- + G. theke, flask]
perithelium
The connective tissue that surrounds smaller vessels and capillaries. [peri- + G. thele, nipple] - Eberth p. an incomplete layer of connective tissue cells encasing the blood ...
perithoracic
Surrounding or encircling the thorax.
perithyroiditis
Inflammation of the capsule or tissues surrounding the thyroid gland.
peritomist
One who performs circumcision.
peritomy
A circumcorneal incision through the conjunctiva. [G. peritome, fr. peri, around, + tome, incision]
peritoneal
Relating to the peritoneum.
Peritoneal dialysis
Technique that uses the patient’s own body tissues inside of the belly (abdominal cavity) to act as a filter. The intestines lie in the abdominal cavity, the space between ...
peritonealgia
A rarely used term for pain in the peritoneum. [peritoneum + G. algos, pain]
peritoneo-
The peritoneum. [L. peritoneum]
peritoneocentesis
Paracentesis of the abdomen. [peritoneum + G. kentesis, puncture]
peritoneoclysis
Irrigation of the abdominal cavity. [peritoneum, + G. klysis, a washing out]
peritoneopathy
A rarely used term for inflammation or other disease of the peritoneum. [peritoneum, + pathos, suffering]
peritoneopericardial
Relating to the peritoneum and the pericardium.
peritoneopexy
A suspension or fixation of the peritoneum. [peritoneum + G. pexis, fixation]
peritoneoplasty
Loosening adhesions and covering the raw surfaces with peritoneum to prevent reformation. [peritoneum + G. plastos, formed]
peritoneoscope
SYN: laparoscope. [peritoneum + G. skopeo, to view]
peritoneoscopy
Examination of the contents of the peritoneum with a peritoneoscope passed through the abdominal wall. See laparoscopy. SYN: celioscopy, ventroscopy.
peritoneotomy
Incision of the peritoneum. [peritoneum + G. tome, incision]
Peritoneum
The membrane that lines the abdominal cavity and covers most of the abdominal organs. (From the Greek peri- meaning around + tonos meaning a stretching = a stretching around). * ...
Peritonitis
Inflammation of the peritoneum (The peritoneum is the tissue layer of cells lining the inner wall of the abdomen and pelvis). Peritonitis can result from infection (such as ...
peritonsillar
Around a tonsil or the tonsils.
Peritonsillar abscess
A collection of pus (an abscess) behind the tonsils that pushes one of the tonsils toward the uvula (the prominent soft tissue dangling from the back of the palate in the back ...
peritonsillitis
Inflammation of the connective tissue above and behind the tonsil.
peritracheal
About the trachea.
Peritrichida
An order of ciliates ( subclass Peritrichia, phylum Ciliophora) characterized by a cylindrical shape with the cilia usually limited to the zone surrounding the mouth opening; ...
peritrichous
1. Relating to cilia or other appendicular organs projecting from the periphery of a cell. 2. Having flagella uniformly distributed over a cell; used especially with reference ...
peritrochanteric
Around a trochanter.
perityphlic
SYN: pericecal. [peri- + G. typhlon, cecum]
perityphlitis
Inflammation of the peritoneum surrounding the cecum. - p. actinomycotica (per′i-tif-li-tis ak′ti-no-mi-kot-i-ka) abdominal infection, predominantly around the cecum, with ...
periumbilical
Around or near the umbilicus. SYN: periomphalic.
periungual
Surrounding a nail; involving the nail folds. [peri- + L. unguis, nail]
periureteral, periureteric
Surrounding one or both ureters.
periureteritis
Inflammation of the tissues about a ureter. [peri- + ureter + G. -itis, inflammation] - p. plastica SYN: retroperitoneal fibrosis.
periurethral
Surrounding the urethra.
periurethritis
Inflammation of the tissues about the urethra. [peri- + urethra + G. -itis, inflammation]
periuterine
SYN: perimetric (1).
periuvular
Around the uvula.
perivaginitis
Inflammation of the connective tissue around the vagina. SYN: pericolpitis.
perivascular
Surrounding a blood or lymph vessel. SYN: circumvascular. [peri- + L. vasculum, vessel]
perivasculitis
SYN: periangitis.
perivenous
Surrounding a vein.
Periventricular leukomalacia, cystic
Softening of the white matter near the ventricles of the brain resulting in abnormal cysts. Cystic periventricular leukomalacia is a major problem in very premature infants. ...
perivertebral
Around a vertebra or vertebrae. SYN: perispondylic.
perivesical
SYN: pericystic. [peri- + L. vesica, bladder]
perivisceral
SYN: perisplanchnic.
perivisceritis
Inflammation surrounding any viscus or viscera. [peri- + L. viscera, internal organs, + G. -itis, inflammation]
perivitelline
Surrounding the vitellus or yolk. [peri- + L. vitellus, yolk]
periwinkle
SYN: Vinca rosea.
perkinism
A form of quackery purporting to treat disease by applying metals with magnetic and magic properties.
Perkins
Elisha, U.S. physician, 1741–1799. See perkinism.
perlèche
SYN: angular cheilitis. [Fr. per, intensive, + lécher, to lick]
Perlia
Richard, 19th century German ophthalmologist. See P. nucleus, convergence nucleus of P..
perlingual
Through or by way of the tongue, denoting a method of medication. [L. per, through, + lingua, tongue]
Perls
Max, German pathologist, 1843–1881. See P. Prussian blue stain, P. test.
permanganate
A salt of permanganic acid. Formerly used in efforts (probably unsuccessful) to oxidize and thus detoxify alkaloidal poisons.
permanganic acid
An acid, HMnO4, derived from manganese, forming permanganates with bases. SEE ALSO: potassium permanganate.
permeability
The property of being permeable.
permeable
Permitting the passage of substances ( e.g., liquids, gases, heat), as through a membrane or other structure. SYN: pervious. [L. permeabilis (see permeate)]
permeant
Able to pass through a particular semipermeable membrane. [L. permeabilis (see permeate)]
permease
Any of a group of membrane-bound carriers (enzymes) that effect the transport of solute through a semipermeable membrane; this term is not typically used with eukaryotes.
permeate
1. To pass through a membrane or other structure, typically by diffusion. 2. That which can so pass. [L. permeo, to pass through]
permeation
The process of spreading through or penetrating, as the extension of a malignant neoplasm by proliferation of the cells continuously along the blood vessel s or lymphatics. [L. ...
perniciosiform
Rarely used term meaning apparently pernicious, denoting a condition or disease that appears to be pernicious or malignant.
pernicious
Destructive; harmful; denoting a disease of severe character and usually fatal without appropriate treatment. [L. perniciosus, destructive, fr. pernicies, destruction]
Pernicious anemia
A blood disorder caused by inadequate vitamin B12 in the blood. Patients who have this disorder do not produce the substance in the stomach that allows the body to absorb ...
Pernicious vomiting of pregnancy
Medically known as hyperemesis gravidarum, this is excessive vomiting in early pregnancy. By definition, hyperemesis gravidarum, leads to the loss of 5% or more of the body ...
perniosis
SYN: chilblain. [L. pernio, chilblain, + G. -osis, condition]
pero-
Maimed, malformed. [G. peros]
perobrachius
An individual with a congenital malformation of one or both hands and forearms. [ pero- + G. brachion, arm]
perocephalus
An individual with congenitally defective face and head. [ pero- + G. kephale, head]
perochirus
An individual with a congenital malformation of one or both hands. [ pero- + G. cheir, hand]
perodactyly, perodactylia
Congenitally malformed fingers or toes. [ pero- + G. daktylos, finger or toe]
perogen
A preparation of sodium perborate that, when mixed with the accompanying catalyzer, liberates 10% of the oxygen in the salt.
peromelia, peromely
Severe congenital malformations of extremities, including absence of hand or foot. [ pero- + G. melos, limb]
perone
SYN: fibula. [G. p., brooch, the small bone of the arm or leg, the fibula, fr. peiro, to pierce]
peroneal
SYN: fibular. [L. peroneus, fr. G. perone, fibula]
Peroneal muscular atrophy
A neuromuscular disease that is the most common inherited disorder of peripheral nerves, characterized by progressively debilitating weakness. Peroneal muscular atrophy is also ...
peroneotibial
SYN: tibiofibular.
peropus
A person with a congenital malformation of one or both feet. [ pero- + G. pous, foot]
peroral
Through the mouth, denoting a method of medication or an approach. [L. per, through, + os (or-), mouth]
perosplanchnia
Congenital malformation of the viscera. [ pero- + G. splanchnon, viscus]
perosseous
Through bone. [L. per, through, + os, bone]
peroxi-
See peroxy-.
peroxidases
Hydrogen peroxide–reducing oxidoreductases; enzymes in animal and plant tissues that catalyze the dehydrogenation (oxidation) of various substances in the presence of hydrogen ...
peroxide
1. That oxide of any series that contains the greatest number of oxygen atoms; applied most correctly to compounds containing an –O–O– link, as in hydrogen p. ...
peroxisome
A membrane-bound organelle occurring in many eukaryotic cells that often has an electron-dense crystalline inclusion containing catalase, urate oxidase, and other oxidative ...
Peroxisome proliferator-activated receptor
A member of the nuclear hormone receptor subfamily of transcription factors. Peroxisome proliferator-activated receptor is abbreviated as PPAR. There are 3 known subtypes of ...
peroxy acid
SYN: peracid.
peroxy-
Prefix denoting the presence of an extra O atom, as in peroxides, peroxy acid s ( e.g., hydrogen peroxide, peroxyformic acid). Often shortened to per-.
peroxyacetyl nitrate
The major pollutant responsible for eye and nose irritation in smog.
peroxyformic acid
SYN: performic acid.
peroxyl
H–O–O; one of the free radicals presumed formed as a result of the bombardment of tissue by high-energy radiation.
perphenazine
An antipsychotic of the phenothiazine type.
persalt
In chemistry, any salt that contains the greatest possible amount of the acid radical.
Persantine thallium scan
A type of myocardial perfusion scan done to disclose any areas of the heart muscle that may not be getting enough blood to perfuse them properly. Persantine (Diprydamole) is a ...
perseveration
1. The constant repetition of a meaningless word or phrase. 2. The duration of a mental impression, measured by the rapidity with which one impression follows another as ...
persic oil
The fixed oil expressed from the kernels of varieties of Prunus armeniaca (apricot kernel oil) or Prunus persica (peach kernel oil); used as a vehicle.
persistence
Obstinate continuation of characteristic behavior, or of existence in spite of treatment or adverse environmental conditions. [L. persisto, to abide, stand firm] - lactase p. an ...
persister
That which, or one who, is capable of persistence; especially a bacterium that exhibits microbial persistence.
person-years
The product of the number of years times the number of members of a population who have been affected by a certain condition; e.g., years of treatment with a certain drug.
persona
A term that embodies the totality of the individual, the total constellation of the physical, psychological, and behavioral attributes of each unique individual; in jungian ...
personality
1. The unique self; the organized system of attitudes and behavioral predispositions by which one feels, thinks, acts, and impresses and establishes relationships with others. 2. ...
Personality disorder, borderline
A serious mental illness characterized by pervasive instability in moods, interpersonal relationships, self-image, and behavior. This instability often disrupts family and work ...
Perspiration
1) The secretion of fluid by the sweat (sudoriferous) glands. These small, tubular glands are situated within the skin, as well as in the subcutaneous tissue under it. They ...
perstillation
See pervaporation. [L. per, through, + stillo, to trickle, distil]
persuasion
The act of influencing the mind of another, by authority, argument, reason, or personal insight; an important element in most types of psychotherapy. [L. persuasio, fr. ...
persulfate
A salt of persulfuric acid.
persulfide
1. The compound of a series of sulfides that contains more atoms of sulfur than any other. 2. The sulfur analog of a peroxide.
persulfuric acid
H2SO5; peroxymonosulfuric acid; an oxidizing agent.
pertactin
An antigenic material produced by Bordetella pertussis used to improve the effectiveness of pertussis vaccines. [pertussis + act + -in]
pertechnetate
Anionic form of technetium used widely in nuclear scanning; 99mTcO4.
Perthes
Georg C., German surgeon, 1869–1927. See P. disease, P. test, Calvé-P. disease, Legg-Calvé-P. disease.
perthio-
Prefix denoting substitution of sulfur for every oxygen in a compound; e.g., perthiocarbonic acid, H2CS3.
Pertik
Otto, Hungarian pathologist, 1852–1913. See P. diverticulum.
Pertussis
Whooping cough, a communicable, potentially deadly illness characterized by fits of coughing followed by a noisy, “whooping” indrawn breath. It is caused by the bacteria ...
Peruvian bark
SYN: cinchona.
PERV
Acronym for the porcine endogenous retrovirus, a pig virus that splices into DNA. PERV belongs to the same class of viruses as the human immunodeficiency virus (HIV). Some of ...
pervaporation
The heating of a liquid within a dialyzing bag suspended over a hot plate, evaporation taking place rapidly through the membrane; any colloids in solution remain within the bag ...
perversion
A deviation from the norm, especially concerning sexual interests or behavior. [L. perversio, fr. per-verto, pp. -versus, to turn about] - polymorphous p. 1. in psychoanalytic ...
pervert
One who practices perversions. SEE ALSO: deviant (2).
perverted
Abnormal, deviant, or disordered.
pervious
SYN: permeable. [L. pervius, fr. per, through, + via, a way]
pes
1. [TA] SYN: foot (1). 2. Any footlike or basal structure or part. 3. Talipes. In this sense, p. is always qualified by a word expressing the specific type. [L.] - p. abductus ...
Pes cavus
Literally a hollow foot, pes cavus is a foot with too high an arch.
pescovegetarian
A vegetarian who consumes dairy products, eggs, and fish, but does not consume other animal flesh.
pessary
1. An appliance of varied form, introduced into the vagina to support the uterus or to correct any displacement. 2. A medicated vaginal suppository. [L. pessarium, fr. G. ...
pessimism
A tendency to see or anticipate the worst. [L. pessimus, worst, irreg. superl. of malus, bad] - therapeutic p. a disbelief in the curative virtues of remedies in general and ...
pest
SYN: plague (2). [L. pestis]
Pest (plague)
An infectious disease due to a bacteria called Yersinia pestis. Y. pestis mainly infects rats and other rodents. Rodents are the prime reservoir for the bacteria. Fleas ...

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