The Collaborative International Dictionary of English v.0.48:

Boil \Boil\ (boil), v. i. [imp. & p. p. Boiled (boild); p. pr.
   & vb. n. Boiling.] [OE. boilen, OF. boilir, builir, F.
   bouillir, fr. L. bullire to be in a bubbling motion, from
   bulla bubble; akin to Gr. ?, Lith. bumbuls. Cf. Bull an
   edict, Budge, v., and Ebullition.]
   1. To be agitated, or tumultuously moved, as a liquid by the
      generation and rising of bubbles of steam (or vapor), or
      of currents produced by heating it to the boiling point;
      to be in a state of ebullition; as, the water boils.
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   2. To be agitated like boiling water, by any other cause than
      heat; to bubble; to effervesce; as, the boiling waves.
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            He maketh the deep to boil like a pot. --Job xii.
                                                  31.
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   3. To pass from a liquid to an a["e]riform state or vapor
      when heated; as, the water boils away.
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   4. To be moved or excited with passion; to be hot or fervid;
      as, his blood boils with anger.
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            Then boiled my breast with flame and burning wrath.
                                                  --Surrey.
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   5. To be in boiling water, as in cooking; as, the potatoes
      are boiling.
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   To boil away, to vaporize; to evaporate or be evaporated by
      the action of heat.

   To boil over, to run over the top of a vessel, as liquid
      when thrown into violent agitation by heat or other cause
      of effervescence; to be excited with ardor or passion so
      as to lose self-control.
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