The Collaborative International Dictionary of English v.0.48:

Mahwa tree \Mah"wa tree`\ (Bot.)
   An East Indian sapotaceous tree (Bassia latifolia, and also
   Bassia butyracea), whose timber is used for wagon wheels,
   and the flowers for food and in preparing an intoxicating
   drink. It is one of the butter trees. The oil, known as mahwa
   and yallah, is obtained from the kernels of the fruit.
   [1913 Webster]

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]