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(pă-pā′vĕr) [L. papaver, poppy (plant)] A genus of as many as 100 species of hardy plants native to the temperate and cold regions of Eurasia, Africa, and North America. It is the type genus of the poppy family, Papaveraceae. SEE: poppy.

P. rhoeas SEE: red poppy.

P. somniferum SEE: opium poppy.


(pă-pă′yă) [Sp. Amerind.] 1. Carica papaya, a large herb of the family Caricaceae, native to the American tropics and cultivated for its edible fruit and latex-bearing leaves and stem, which contain digestive enzymes.

2. Large, oblong, edible fruit of the Carica papaya plant; the source of the digestive enzyme papain.


(pā′pĕr) [L. papyrus, papyrus, paper] 1. Cellulose pulp prepared in thin sheets from fibers of wood, rags, and other substances. 2. Charta. 3. A thin sheet of cellulosic material impregnated with specific chemicals that react in a definite manner when exposed to certain solutions. This permits use of these papers for testing purposes.

articulating p. Paper coated on one or both sides with a pigment that marks the teeth during dental occlusion. This allows the contact points of the teeth to be demonstrated.

PATIENT CARE: It is often used to assess the patient's bite after restorative procedures.

bibulous p. Paper that absorbs water readily.

filter p. A porous, unglazed paper used for filtration of solids from liquids or gases. It is manufactured in different pore sizes so as to retain different sized particles.

indicator p. Paper saturated with a solution of known strength and then dried; used for testing the pH (or other properties) of a solution.

litmus p. Chemically prepared blue paper that contains a hydrogen-ion sensitive dye, is turned red by acids, and remains blue in alkali solutions; pH range is 4.5 to 8.5. SEE: indicator.

test p. Paper impregnated with a substance that will change color when exposed to solutions of a certain pH or to specific chemicals.


(pă-pil′ă, pă-pil′ē″, pă-pil′ī″) pl. papillae [L. papilla, nipple, teat] A small nipple-like protuberance or elevation.

circumvallate p. Any of the large papillae near the base on the dorsal aspect of the tongue, arranged in a V-shape. The taste buds are located in the epithelium of the trench surrounding the papilla. SYN: vallate p.

dental p. A mass of connective tissue that becomes enclosed by the developing enamel organ, and gives rise to dentin and dental pulp.

dermal p. Any of the small papillae of the corium that indent the ...

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