Webster's English Dictionary

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dissepiment

dis.sep.i.ment \dis-'ep-*-m*nt\ n [L dissaepimentum partition, fr. 
   dissaepire to divide, fr. dis-)X + saepire to fence in - more at SEPTUM : a 
   dividing tissue : SEPTUM; esp : a partition between ce lls of a compound 
   plant ovary