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Psitta-co-fulvine :: Psitta-co-fulvine (n.) A yellow pigment found in the feathers of certain parrots.

Porism :: Porism (n.) A proposition affirming the possibility of finding such conditions as will render a certain determinate problem indeterminate or capable of innumerable solutions.

Pedometer :: Pedometer (n.) An instrument for including the number of steps in walking, and so ascertaining the distance passed over. It is usually in the form of a watch; an oscillating weight by the motion of the body causes the index to advance a certain distance at each step..

Blackmail :: Blackmail (n.) A certain rate of money, corn, cattle, or other thing, anciently paid, in the north of England and south of Scotland, to certain men who were allied to robbers, or moss troopers, to be by them protected from pillage..

Trona :: Trona (n.) A native double salt, consisting of a combination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum..

Square :: Square (n.) A certain number of lines, forming a portion of a column, nearly square; -- used chiefly in reckoning the prices of advertisements in newspapers..

Lamarckism :: Lamarckism (n.) The theory that structural variations, characteristic of species and genera, are produced in animals and plants by the direct influence of physical environments, and esp., in the case of animals, by effort, or by use or disuse of certain organs..

Liberty :: Liberty (n.) A certain amount of freedom; permission to go freely within certain limits; also, the place or limits within which such freedom is exercised; as, the liberties of a prison..

Bail :: Bail (n.) A certain limit within a forest.

Microspore :: Microspore (n.) One of the exceedingly minute spores found in certain flowerless plants, as Selaginella and Isoetes, which bear two kinds of spores, one very much smaller than the other. Cf. Macrospore..

Rechabite :: Rechabite (n.) One of the descendants of Jonadab, the son of Rechab, all of whom by his injunction abstained from the use of intoxicating drinks and even from planting the vine. Jer. xxxv. 2-19. Also, in modern times, a member of a certain society of abstainers from alcoholic liquors..

Galactose :: Galactose (n.) A white, crystalline sugar, C6H12O6, isomeric with dextrose, obtained by the decomposition of milk sugar, and also from certain gums. When oxidized it forms mucic acid. Called also lactose (though it is not lactose proper)..

Aggregate :: Aggregate (a.) United into a common organized mass; -- said of certain compound animals.

Chest :: Chest (n.) A case in which certain goods, as tea, opium, etc., are transported; hence, the quantity which such a case contains..

Range :: Range (v. i.) To be native to, or live in, a certain district or region; as, the peba ranges from Texas to Paraguay..

Tun :: Tun (n.) A certain measure for liquids, as for wine, equal to two pipes, four hogsheads, or 252 gallons. In different countries, the tun differs in quantity..

Tributer :: Tributer (n.) One who works for a certain portion of the ore, or its value..

Hydrophyllium :: Hydrophyllium (n.) One of the flat, leaflike, protective zooids, covering other zooids of certain Siphonophora..

Demonstration :: Demonstration (n.) A course of reasoning showing that a certain result is a necessary consequence of assumed premises; -- these premises being definitions, axioms, and previously established propositions..

Rille :: Rille (n.) One of certain narrow, crooked valleys seen, by aid of the telescope, on the surface of the moon..

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