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n. [ OE. rasour, OF. rasur, LL. rasor: cf. F. rasoir, LL. rasorium. See Raze, v. t., Rase, v. t. ] 1. A keen-edged knife of peculiar shape, used in shaving the hair from the face or the head; also called a straight razor. “Take thee a barber's razor.” Ezek. v. 1. [ 1913 Webster ]

2. a device used for shaving, having a replaceable blade with a very sharp edge; also called safety razor. Also a similar device, made of plastic, in which the blade is neither replaceable nor can be sharpened, intended to be discarded after the blade dulls -- called a disposable razor. [ PJC ]

3. (Zool.) A tusk of a wild boar. [ 1913 Webster ]

Razor fish. (Zool.) (a) A small Mediterranean fish (Coryphaena novacula), prized for the table. (b) The razor shell. --
Razor grass (Bot.), a West Indian plant (Scleria scindens), the triangular stem and the leaves of which are edged with minute sharp teeth. --
Razor grinder (Zool.), the European goat-sucker. --
Razor shell (Zool.), any marine bivalve shell belonging to Solen and allied genera, especially Solen ensis (or Ensatella ensis), and Solen Americana, which have a long, narrow, somewhat curved shell, resembling a razor handle in shape. Called also razor clam, razor fish, knife handle. --
Razor stone. Same as Novaculite. --
Razor strap, or
razor strop, a strap or strop used in sharpening razors. [ 1913 Webster ]

a. Ready for the razor; fit to be shaved. [ R. ] Shak. [ 1913 Webster ]

n. (Zool.) The rorqual. [ 1913 Webster ]

a. (Zool.) Having a sharp, lean, or thin back; as, a razor-backed hog, perch, etc. [ 1913 Webster ]

n. (Zool.) (a) A species of auk (Alca torda) common in the Arctic seas. See Auk, and Illust. in Appendix. (b) See Cutwater, 3. [ 1913 Webster ]

a. having an edge as sharp as that of a razor; very sharp. [ PJC ]

a. as thin as a razor blade; very thin. [ PJC ]

a. [ Tetra- + azo-. ] (Chem.) A combining form (also used adjectively), designating any one of a series of double derivatives of the azo and diazo compounds containing four atoms of nitrogen. [ 1913 Webster ]

n. [ Tetrazo- + -ole. ] (Org. Chem.) A crystalline acid substance, CH2N4, which may be regarded as pyrrol in which nitrogen atoms replace three CH groups; also, any of various derivatives of the same. [ Webster 1913 Suppl. ]

n. (Chem.) Any one of a certain series of basic compounds containing a chain of four nitrogen atoms; for example, ethyl tetrazone, (C2H5)2N.N2.N(C2H5)2, a colorless liquid having an odor of leeks. [ 1913 Webster ]

a. [ Pref. ultra- + zodiacal. ] (Astron.) Outside the zodiac; being in that part of the heavens that is more than eight degrees from the ecliptic; as, ultrazodiacal planets, that is, those planets which in part of their orbits go beyond the zodiac. [ 1913 Webster ]