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The Collaborative International Dictionary
Quaternate

Quaternate \Qua*ter"nate\, a. Composed of, or arranged in, sets of four; quaternary; as, quaternate leaves.

Wiktionary
quaternate

a. Composed of, or arranged in, sets of four.

WordNet
quaternate

adj. consisting of or especially arranged in sets of four; "quaternate leaves"; "a quaternary compound" [syn: quaternary]