in·de·his·cent /ˌɪndɪˈhɪsṇt/
  (a.)果皮不裂的
  In·de·his·cent a.  Bot. Remaining closed at maturity, or not opening along regular lines, as the acorn, or a cocoanut.
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  indehiscent
       adj : (of e.g. fruits) not opening spontaneously at maturity to
             release seeds [ant: dehiscent]