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The Collaborative International Dictionary
Syndyasmian

Syndyasmian \Syn`dy*as"mi*an\, a. [Gr. syndyasmo`s a pairing, fr. syndya`zein to pair.] Pertaining to the state of pairing together sexually; -- said of animals during periods of procreation and while rearing their offspring.
--Morgan.

Wiktionary
syndyasmian

a. Pertaining to the state of pairing together sexually; said of animals during periods of procreation and while rearing their offspring.