Source : Webster's Revised Unabridged Dictionary (1913)

Butter \But"ter\ (b[u^]t"t[~e]r), n. [OE. botere, butter, AS.
   butere, fr. L. butyrum, Gr. boy`tyron; either fr. boy`s ox,
   cow + tyro`s cheese; or, perhaps, of Scythian origin. Cf.
   {Cow}.]
   1. An oily, unctuous substance obtained from cream or milk by
      churning.

   2. Any substance resembling butter in degree of consistence,
      or other qualities, especially, in old chemistry, the
      chlorides, as butter of antimony, sesquichloride of
      antimony; also, certain concrete fat oils remaining nearly
      solid at ordinary temperatures, as butter of cacao,
      vegetable butter, shea butter.

   {Butter and eggs} (Bot.), a name given to several plants
      having flowers of two shades of yellow, as {Narcissus
      incomparabilis}, and in the United States to the toadflax
      ({Linaria vulgaris}).

   {Butter boat}, a small vessel for holding melted butter at
      table.

   {Butter flower}, the buttercup, a yellow flower.

   {Butter print}, a piece of carved wood used to mark pats of
      butter; -- called also {butter stamp}. --Locke.

   {Butter tooth}, either of the two middle incisors of the
      upper jaw.

   {Butter tree} (Bot.), a tree of the genus {Bassia}, the seeds
      of which yield a substance closely resembling butter. The
      butter tree of India is the {B. butyracea}; that of Africa
      is the Shea tree ({B. Parkii}). See {Shea tree}.

   {Butter trier}, a tool used in sampling butter.

   {Butter wife}, a woman who makes or sells butter; -- called
      also {butter woman}. [Obs. or Archaic]

Butter \But"ter\, v. t. [imp. & p. p. {Buttered} (?); p. pr. &
   vb. n. {Buttering}.]
   1. To cover or spread with butter.

            I know what's what. I know on which side My bread is
            buttered.                             --Ford.

   2. To increase, as stakes, at every throw or every game.
      [Cant] --Johnson.

Butter \Butt"er\, n.
   One who, or that which, butts.

Source : WordNet®

butter
     v : spread butter on; "butter bread"

butter
     n 1: an edible emulsion of fat globules made by churning milk or
          cream; for cooking and table use
     2: a fighter who strikes the opponent with his head