• (a.) Dehiscent into four similar parts; four-valved; as, a quadrivalve pericarp. • (n.) A door, shutter, or the like, having four folds.
Quad'ri·valve adjective [ Quadri- + valve : confer French quadrivalve .] (Botany) Dehiscent into four similar parts; four-valved; as, a quadrivalve pericarp. 
In architecture the term quadrivalve describes a door, shutter, or the like, having four folds.