The Collaborative International Dictionary of English v.0.48:

Mouse \Mouse\ (mous), n.; pl. Mice (m[imac]s). [OE. mous, mus,
   AS. m[=u]s, pl. m[=y]s; akin to D. muis, G. maus, OHG. &
   Icel. m[=u]s, Dan. muus, Sw. mus, Russ. muishe, L. mus, Gr.
   my^s, Skr. m[=u]sh mouse, mush to steal. [root]277. Cf.
   Muscle, Musk.]
   1. (Zool.) Any one of numerous species of small rodents
      belonging to the genus Mus and various related genera of
      the family Muridae. The common house mouse (Mus
      musculus) is found in nearly all countries. The American
      white-footed mouse, or deer mouse (Peromyscus
      leucopus, formerly Hesperomys leucopus) sometimes lives
      in houses. See Dormouse, Meadow mouse, under Meadow,
      and Harvest mouse, under Harvest.
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   2. (Naut.)
      (a) A knob made on a rope with spun yarn or parceling to
          prevent a running eye from slipping.
      (b) Same as 2d Mousing, 2.
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   3. A familiar term of endearment. --Shak.
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   4. A dark-colored swelling caused by a blow. [Slang]
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   5. A match used in firing guns or blasting.
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   Field mouse, Flying mouse, etc. See under Field,
      Flying, etc.

   Mouse bird (Zool.), a coly.

   Mouse deer (Zool.), a chevrotain, as the kanchil.

   Mouse galago (Zool.), a very small West American galago
      (Galago murinus). In color and size it resembles a
      mouse. It has a bushy tail like that of a squirrel.

   Mouse hawk. (Zool.)
      (a) A hawk that devours mice.
      (b) The hawk owl; -- called also mouse owl.

   Mouse lemur (Zool.), any one of several species of very
      small lemurs of the genus Chirogaleus, found in
      Madagascar.

   Mouse piece (Cookery), the piece of beef cut from the part
      next below the round or from the lower part of the latter;
      -- called also mouse buttock.
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The Collaborative International Dictionary of English v.0.48:

Deer \Deer\ (d[=e]r), n. sing. & pl. [OE. der, deor, animal,
   wild animal, AS. de['o]r; akin to D. dier, OFries. diar, G.
   thier, tier, Icel. d[=y]r, Dan. dyr, Sw. djur, Goth. dius; of
   unknown origin. [root]71.]
   1. Any animal; especially, a wild animal. [Obs.] --Chaucer.
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            Mice and rats, and such small deer.   --Shak.
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            The camel, that great deer.           --Lindisfarne
                                                  MS.
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   2. (Zool.) A ruminant of the genus Cervus, of many species,
      and of related genera of the family Cervid[ae]. The
      males, and in some species the females, have solid
      antlers, often much branched, which are shed annually.
      Their flesh, for which they are hunted, is called
      venison.
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   Note: The deer hunted in England is Cervus elaphus, called
         also stag or red deer; the fallow deer is Cervus
         dama; the common American deer is Cervus
         Virginianus; the blacktailed deer of Western North
         America is Cervus Columbianus; and the mule deer of
         the same region is Cervus macrotis. See Axis,
         Fallow deer, Mule deer, Reindeer.
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   Note: Deer is much used adjectively, or as the first part of
         a compound; as, deerkiller, deerslayer, deerslaying,
         deer hunting, deer stealing, deerlike, etc.
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   Deer mouse (Zool.), the white-footed mouse (Peromyscus
      leucopus, formerly Hesperomys leucopus) of America.

   Small deer, petty game, not worth pursuing; -- used
      metaphorically. (See citation from Shakespeare under the
      first definition, above.) "Minor critics . . . can find
      leisure for the chase of such small deer." --G. P. Marsh.
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