The Collaborative International Dictionary of English v.0.48:

Osculate \Os"cu*late\, v. t. [imp. & p. p. Osculated; p. pr. &
   vb. n. Osculating.] [L. osculatus, p. p. of osculari to
   kiss, fr. osculum a little mouth, a kiss, dim. of os mouth.
   See Oral, and cf. Oscillate.]
   [1913 Webster]
   1. To kiss.
      [1913 Webster]

   2. (Geom.) To touch closely, so as to have a common curvature
      at the point of contact. See Osculation, 2.
      [1913 Webster]