Source : Webster's Revised Unabridged Dictionary (1913)

Crossbill \Cross"bill`\ (-b[i^]l`). (Law)
   A bill brought by a defendant, in an equity or chancery suit,
   against the plaintiff, respecting the matter in question in
   that suit. --Bouvier.

   Note: In criminal practice, cross bills of indictment for
         assault, in which the prosecutor in once case is the
         defendant in another, may be tried together.

Crossbill \Cross"bill`\, n. (Zo["o]l.)
   A bird of the genus {Loxia}, allied to the finches. Their
   mandibles are strongly curved and cross each other; the
   crossbeak.

Source : WordNet®

crossbill
     n : finch with a bill whose tips cross when closed [syn: {Loxia
         curvirostra}]