The Collaborative International Dictionary of English v.0.48:

Dehiscent \De*his"cent\, a. [L. dehiscens, -entis, p. pr. Cf. F.
   d['e]hiscent.]
   Characterized by dehiscence; opening in some definite way, as
   the capsule of a plant.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dehiscent
    adj 1: (of e.g. fruits and anthers) opening spontaneously at
           maturity to release seeds [ant: indehiscent]