(1) (botany) Of a flower bud in which the perianth meet at the margins and not overlapping, such as in flower buds of many Hydrangea species.
(2) (botany) Resembling or functioning as a valve; through the valves (e.g. valvate dehiscence).
(3) Of, pertaining to, or composed of valve-like part(s).
Word origin: Latin valvātus (with folding doors)