Borer

from WordNet (r) 3.0 (2006)
borer
    n 1: a drill for penetrating rock [syn: {bore bit}, {borer},
         {rock drill}, {stone drill}]
    2: any of various insects or larvae or mollusks that bore into
       wood [syn: {woodborer}, {borer}]
    
from The Collaborative International Dictionary of English v.0.48
Hag \Hag\ (h[a^]g), n. [OE. hagge, hegge, witch, hag, AS.
   h[ae]gtesse; akin to OHG. hagazussa, G. hexe, D. heks, Dan.
   hex, Sw. h[aum]xa. The first part of the word is prob. the
   same as E. haw, hedge, and the orig. meaning was perh., wood
   woman, wild woman. [root]12.]
   1. A witch, sorceress, or enchantress; also, a wizard. [Obs.]
      "[Silenus] that old hag." --Golding.
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   2. An ugly old woman. --Dryden.
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   3. A fury; a she-monster. --Crashaw.
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   4. (Zool.) An eel-like marine marsipobranch ({Myxine
      glutinosa}), allied to the lamprey. It has a suctorial
      mouth, with labial appendages, and a single pair of gill
      openings. It is the type of the order {Hyperotreta}.
      Called also {hagfish}, {borer}, {slime eel}, {sucker}, and
      {sleepmarken}.
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   5. (Zool.) The hagdon or shearwater.
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   6. An appearance of light and fire on a horse's mane or a
      man's hair. --Blount.
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   {Hag moth} (Zool.), a moth ({Phobetron pithecium}), the larva
      of which has curious side appendages, and feeds on fruit
      trees.

   {Hag's tooth} (Naut.), an ugly irregularity in the pattern of
      matting or pointing.
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from The Collaborative International Dictionary of English v.0.48
Borer \Bor"er\, n.
   1. One that bores; an instrument for boring.
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   2. (Zool.)
      (a) A marine, bivalve mollusk, of the genus {Teredo} and
          allies, which burrows in wood. See {Teredo}.
      (b) Any bivalve mollusk ({Saxicava}, {Lithodomus}, etc.)
          which bores into limestone and similar substances.
      (c) One of the larv[ae] of many species of insects, which
          penetrate trees, as the apple, peach, pine, etc. See
          {Apple borer}, under {Apple}.
      (d) The hagfish ({Myxine}).
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