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| | | | protactinium | (n) a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead, Syn. protoactinium, atomic number 91, Pa | | protagonist | (n) the principal character in a work of fiction, Syn. agonist | | protamine | (n) a simple protein found in fish sperm; rich in arginine; simpler in composition than globulin or albumin; counteracts the anticoagulant effect of heparin | | protanopia | (n) dichromacy characterized by lowered sensitivity to long wavelengths of light resulting in an inability to distinguish red and purplish blue, Syn. red-blindness | | protanopic | (adj) inability to see the color red or to distinguish red and bluish-green, Syn. red-blind | | protea | (n) any tropical African shrub of the genus Protea having alternate rigid leaves and dense colorful flower heads resembling cones | | proteaceae | (n) large family of Australian and South African shrubs and trees with leathery leaves and clustered mostly tetramerous flowers; constitutes the order Proteales, Syn. family Proteaceae, protea family | | proteales | (n) coextensive with the family Proteaceae, Syn. order Proteales | | protean | (adj) taking on different forms, Example: eyes...of that baffling protean grey which is never twice the same | | protease | (n) any enzyme that catalyzes the splitting of proteins into smaller peptide fractions and amino acids by a process known as proteolysis, Syn. proteolytic enzyme, peptidase, proteinase |
| | Protactic | a. [ Gr. protaktiko`s placing or placed before, fr. prota`ssein to place in front; pro` before + ta`ssein to arrange. ] Giving a previous narrative or explanation, as of the plot or personages of a play; introductory. [ 1913 Webster ] | | Protactinium | . The radioactive chemical element, of atomic number 91; Atomic symbol Pa; at. wt. of longest-lived isotope, 231 (T1/2 = 32, 500 yrs.) Also called brevium, Uranium X2 and UX2. [ PJC ] | | Protagon | n. [ Proto- + Gr. 'agw`n a contest. See. Protagonist. So called because it was the first definitely ascertained principle of the brain. ] (Physiol. Chem.) A nitrogenous phosphorized principle found in brain tissue. By decomposition it yields neurine, fatty acids, and other bodies. [ 1913 Webster ] | | Protagonist | n. [ Gr. prwtagonisth`s; prw^tos first + 'agonisth`s an actor, combatant, fr. 'agw`n a contest. ] One who takes the leading part in a drama; hence, one who takes lead in some great scene, enterprise, conflict, or the like. [ 1913 Webster ] Shakespeare, the protagonist on the great of modern poetry. De Quincey. [ 1913 Webster ] | | Protamin | n. [ Gr. prw^tos first. ] (Physiol. Chem.) An amorphous nitrogenous substance found in the spermatic fluid of salmon. It is soluble in water, which an alkaline reaction, and unites with acids and metallic bases. [ 1913 Webster ] | | Protandric | a. [ Proto- + Gr. &unr_;, &unr_;, a man. ] (Zool.) Having male sexual organs while young, and female organs later in life. -- Pro*tan"trism n. [1913 Webster] | | Protandrous | a. (Bot.) Proterandrous. [ 1913 Webster ] | | Protasis | ‖n. [ L., fr. Gr. pro`tasis, fr. protei`nein to stretch before, forward; pro` before + tei`nein to stretch. ] 1. A proposition; a maxim. Johnson. [ 1913 Webster ] 2. (Gram.) The introductory or subordinate member of a sentence, generally of a conditional sentence; -- opposed to apodosis. See Apodosis. [ 1913 Webster ] 3. The first part of a drama, of a poem, or the like; the introduction; opposed to epitasis. B. Jonson. [ 1913 Webster ] | | Protatic | a. [ Gr. protatiko`s: cf. L. protaticus, F. protatique. ] Of or pertaining to the protasis of an ancient play; introductory. [ 1913 Webster ] | | Proteaceous | a. [ From Proteus. ] (Bot.) Of or pertaining to the Proteaceæ, an order of apetalous evergreen shrubs, mostly natives of the Cape of Good Hope or of Australia. [ 1913 Webster ] |
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