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]