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From The Collaborative International Dictionary of English v.0.48:
Wireworm \Wire"worm`\, n. (Zool.) (a) One of the larvae of various species of snapping beetles, or elaters; -- so called from their slenderness and the uncommon hardness of the integument. Wireworms are sometimes very destructive to the roots of plants. Called also wire grub. (b) A galleyworm. [1913 Webster]