Source : Webster's Revised Unabridged Dictionary (1913)

Osculant \Os"cu*lant\, a. [L. osculans, -antis, p. pr. of
   osculari to kiss. See {Osculate}.]
   1. Kissing; hence, meeting; clinging.

   2. (Zo["o]l.) Adhering closely; embracing; -- applied to
      certain creeping animals, as caterpillars.

   3. (Biol.) Intermediate in character, or on the border,
      between two genera, groups, families, etc., of animals or
      plants, and partaking somewhat of the characters of each,
      thus forming a connecting link; interosculant; as, the
      genera by which two families approximate are called
      osculant genera.