indehiscent

adjective

Not splitting open at maturity.

In botany, not dehiscent; not opening spontaneously when mature, as a capsule or anther.

adjective

Remaining closed at maturity, or not opening along regular lines, as the acorn, or a cocoanut.

adjective

Not dehiscing when mature; not dehiscent.

adjective

(of e.g. fruits) not opening spontaneously at maturity to release seeds