Webster 1913 Edition
valvatushaving folding doors.]
Resembling, or serving as, a valve; consisting of, or opening by, a valve or valves; valvular.
Meeting at the edges without overlapping; – said of the sepals or the petals of flowers in aestivation, and of leaves in vernation.
Opening as if by doors or valves, as most kinds of capsules and some anthers.
Webster 1828 Edition