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P

pachy-
in botany, thick

PAF antagonist
platelet activating factor inhibitor. PAF activates platelets to secrete serotonin and other mediators to cause smooth-muscle contraction and vascular permeability, involved in asthma; a PAF antagonist counters these effects

pancreatitis
inflammation of the pancreas

papaverine-like
mildly analgesic, powerfully antispasmodic

paracrine
hormonal response from cell to cell near a secretory site

parametritis
inflammation of the tissues adjacent to the uterus

parasympathetic nervous system
portion of the autonomic nervous system that is generally associated with increasing digestion and intestinal muscle activity; decreasing blood circulation and respiration

parasympatholytic
agent, such as atropine, that annuls or antagonizes the effects of the parasympathetic nervous system

parasympathomimetic
drugs or chemicals having an action resembling that caused by stimulation of the parasympathetic nervous system, e.g., acetylcholine

parenteral administration
administration by means other than the digestive tract, such as intravenous, subcutaneous, intramuscular, or intramedullary injection

paresthesia
abnormal sensation, such as burning or prickling

parvi-
in botany, small

pericarditis sicca
fibrinous inflammation of the external surface of the heart and its surrounding membrane without the accumulation of fluid

periodontitis
inflammation of the area around a tooth

periostitis
inflammation of the thick fibrous membrane surrounding a bone

peristalsis
movement characterized by alternate circular contraction and relaxation of the intestine or other tubular structure which propels the contents onward

peritoneum
serous sac lining the abdominal cavity and covering most of the organs inside it

phaeo-
in botany, dark

phagocytosis
process of ingestion and digestion by cells of solid substances such as other cells, bacteria, dead tissue, and foreign particles

phanero-
in botany, easily seen

pharmacokinetics
the study of the absorption, distribution, metabolism and excretion of drugs and other substances in living organisms

pharyngeal
related to the upper expanded portion of the digestive tube, between the esophagus below and the mouth and nasal cavities above and in front

pheochromocytoma
encapsulated tumor of the adrenal gland secreting epinephrine and norepinephrine

phlebectasia
dilation of the veins

phlebitis
inflammation of a vein

phospholipid
a phosphorus-containing lipid; an important constituent of cell membranes

photosensitization
process of increasing sensitivity to sunlight

picro-
in botany, bitter

podo-
in botany, of a foot

polydipsia
chronic excessive thirst

portal circulation
circulation in which the outflow from one organ goes directly to a second organ, most commonly used to refer to the venous circulation of the intestine which goes to the liver

poultice
soft mass prepared by moistening botanicals or other absorbent substances with oil or water, usually applied hot to the skin

proctitis
inflammation of the mucous membranes of the rectum

prodrug
a drug whose actions result from its conversion by metabolic processes within the body

prolactin
an anterior pituitary peptide hormone that initiates and maintains lactation

prostaglandin
any of a class of physiologically active substances present in many tissues, with effects such as vasodilation, vasoconstriction, stimulation of the smooth muscles of the bronchus or intestine, uterine stimulation; also involved in pain, inflammation, fever, allergic diarrhea, and dysmennorhea

prostatectomy
removal of the prostate gland

prothrombin
protein needed for clotting of the blood

pruritis ani
anal itching

pruritus
itching

pseudomelanosis coli
changes in the pigmentation of the colon

psoriasis
inherited condition characterized by the eruption of reddish, scaled papules on the skin of the elbows, knees, scalp, and trunk

psychoanaleptic drugs
central nervous system stimulants that reverse depression

psychogenic
of a psychological origin

ptycho-
in botany, pertaining to grooves or folds

pulmonary edema
accumulation of fluid in the lung

pungent principles
essential oils imparting odor

purpura
bleeding into the tissues directly beneath skin or mucous membranes

pustule
small elevation of the skin containing pus

pyelonephritis
inflammation of the renal pelvis

pylorospasm
abnormal contraction of the lower sphincter of the stomach

pyretic
fever-inducing agent

pyro-
in botany, fiery

pyrrho-
in botany, fire red, ruby red