The Collaborative International Dictionary of English v.0.48:

Butter \But"ter\ (b[u^]t"t[~e]r), n. [OE. botere, butter, AS.
   butere, fr. L. butyrum, Gr. boy`turon; either fr. boy`s ox,
   cow + turo`s cheese; or, perhaps, of Scythian origin. Cf.
   Cow.]
   1. An oily, unctuous substance obtained from cream or milk by
      churning.
      [1913 Webster]

   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.
      [1913 Webster]

   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 Bassia butyracea; that of
      Africa is the Shea tree (Bassia 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]
      [1913 Webster]