Source : Webster's Revised Unabridged Dictionary (1913)

Mole \Mole\, n. [AS. m[=a]l; akin to OHG. meil, Goth. mail Cf.
   {Mail} a spot.]
   1. A spot; a stain; a mark which discolors or disfigures.
      [Obs.] --Piers Plowman.

   2. A spot, mark, or small permanent protuberance on the human
      body; esp., a spot which is dark-colored, from which
      commonly issue one or more hairs.

Mole \Mole\, n. [L. mola.]
   A mass of fleshy or other more or less solid matter generated
   in the uterus.

Mole \Mole\, n. [F. m[^o]le, L. moles. Cf. {Demolish},
   {Emolument}, {Molest}.]
   A mound or massive work formed of masonry or large stones,
   etc., laid in the sea, often extended either in a right line
   or an arc of a circle before a port which it serves to defend
   from the violence of the waves, thus protecting ships in a
   harbor; also, sometimes, the harbor itself. --Brande & C.

Mole \Mole\, n. [OE. molle, either shortened fr. moldwerp, or
   from the root of E. mold soil: cf. D. mol, OD. molworp. See
   {Moldwarp}.]
   1. (Zo["o]l.) Any insectivore of the family {Talpid[ae]}.
      They have minute eyes and ears, soft fur, and very large
      and strong fore feet.

   Note: The common European mole, or moldwarp ({Talpa
         Europ[ae]a}), is noted for its extensive burrows. The
         common American mole, or shrew mole ({Scalops
         aquaticus}), and star-nosed mole ({Condylura cristata})
         have similar habits.

   Note: In the Scriptures, the name is applied to two
         unindentified animals, perhaps the chameleon and mole
         rat.

   2. A plow of peculiar construction, for forming underground
      drains. [U.S.]

Mole \Mole\, v. t. [imp. & p. p. {Moled}; p. pr. & vb. n.
   {Moling}.]
   1. To form holes in, as a mole; to burrow; to excavate; as,
      to mole the earth.

   2. To clear of molehills. [Prov. Eng.] --Pegge.

Source : WordNet®

mole
     n 1: the molecular weight of a substance expressed in grams; the
          basic unit of amount of substance adopted under the
          Systeme International d'Unites [syn: {gram molecule}, {mol}]
     2: a spy who works against enemy espionage [syn: {counterspy}]
     3: spicy sauce often containing chocolate
     4: a small congenital pigmented spot on the skin
     5: a protective structure of stone or concrete; extends from
        shore into the water to prevent a beach from washing away
        [syn: {breakwater}, {groin}, {groyne}, {bulwark}, {seawall},
         {jetty}]
     6: small velvety-furred burrowing mammal having small eyes and
        fossorial forefeet