Word of the Day

Friday, April 18, 2014

dyad

\DAHY-ad\ , noun;
1.
a group of two; couple; pair.
2.
Biology. a. a secondary morphological unit, consisting of two monads: a chromosome dyad. b. the double chromosomes resulting from the separation of the four chromatids of a tetrad.
3.
Chemistry. an element, atom, or group having a valence of two. Compare monad, triad (def. 2a).
4.
Mathematics. two vectors with no symbol connecting them, usually considered as an operator.
5.
Sociology. a. two persons involved in an ongoing relationship or interaction. b. the relationship or interaction itself.
adjective:
1.
of two parts; dyadic.
Quotes:
The novel burrows into the separate and often separated perspectives of this strange dyad, Dial and Che.
-- James Wood, "Notes from Underground," The New Yorker, March 3, 2008
...she stayed close by imitating his distance from her with an equal and identical distance from him and, extending out into the world beyond the father-daughter dyad, from all of humanity.
-- Matthew Sharpe, The Sleeping Father, 2003
Origin:
Dyad is derived from the Greek word dyad- which meant "pair, equivalent."
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