Webster's English Dictionary

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involucre

in.vo.lu.cre \'in-v*-.lu:-k*r\ \-k*rd\ \.in-v*-'lu:-kr*-.fo.rm\ n [F, fr. 
   NL involucrum] : one or more whorls of bracts situated below and close to a 
   flower, flowe r cluster, or fruit - in.vo.lu.cred aj