1
: pair
specifically, sociology
: two individuals (such as husband and wife) maintaining a sociologically significant relationship
2
genetics
: a meiotic chromosome after separation of the two homologous (see homologous sense 1a(2)) members of a tetrad
3
mathematics
: an operator (see operator sense 3a) indicated by writing the symbols of two vectors (see vector entry 1 sense 1a) without a dot or cross between
In the equation D = AB, AB is a dyad.
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Merriam-Webster unabridged
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