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Definition of: dyad
(dī′ad) adjective
1. Chem. Having a combining power of two; bivalent.
2. Dyadic.
—noun
1. A pair of units; duad.
2. Chem. An atom, radical, or element that has a combining power of two. See VALENCE.
3. Biol. a One of a pair of chromosomes, especially in the prophases of the second division in the formation of gametes. See TETRAD. b A secondary unit made up of an aggregate of monads. [<L dyas, dyadis <Gk. dyas the number two]
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