The Collaborative International Dictionary of English v.0.48:

Calve \Calve\ (k[aum]v), v. i. [imp. & p. p. Calved 3; p. pr.
   & vb. n. Calving.] [AS. cealfian. See Calf.]
   1. To bring forth a calf. "Their cow calveth." --Job xxi. 10.
      [1913 Webster]

   2. To bring forth young; to produce offspring.
      [1913 Webster]

            Canst thou mark when the hinds do calve? --Job
                                                  xxxix. 1.
      [1913 Webster]

            The grassy clods now calved.          --Molton.
      [1913 Webster]

   3. (Phys. Geog.) To throw off fragments which become
      icebergs; -- said of a glacier.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

calving
    n 1: giving birth to a calf