Adjacent Words

Tetrad definitions

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Webster's 1828 Dictionary

TET'RAD, n. [Gr. the number four.] The number four; a collection of four things.

WordNet (r) 3.0 (2005)

n
1: the cardinal number that is the sum of three and one [syn: four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe]

Merriam Webster's

noun Etymology: Greek tetrad-, tetras, from tetra- Date: 1653 a group or arrangement of four: as a. a group of four cells produced by the successive divisions of a mother cell <a tetrad of spores> b. a group of four synapsed chromatids that become visibly evident in the pachytene stage of meiotic prophase • tetradic adjective

Oxford Reference Dictionary

n. 1 a group of four. 2 the number four. Etymology: Gk tetras -ados (as TETRA-)

Webster's 1913 Dictionary

Tetrad Tet"rad, n. [L. tetras, -adis, Gr. ?, ?: cf. F. t['e]trade.] 1. The number four; a collection of four things; a quaternion. 2. (Chem.) A tetravalent or quadrivalent atom or radical; as, carbon is a tetrad.

Soule's Dictionary of English Synonyms

n. Four, quaternion.