Webster's English Dictionary

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elytron

el.y.tron also el.y.trum \'el-*-.tra:n\ \-tr*m\ \-tr*\ n also el.y.tra [NL, 
   fr. elytron sheath, wing cover, fr. eilyein to roll, wrap] pl  : one of the 
   anterior wings in beetles and some other insects that serve t o protect the 
   posterior pair of functional wings