Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. To bring forth young; to produce offspring.

            Canst thou mark when the hinds do calve? --Job
                                                  xxxix. 1.

            The grassy clods now calved.          --Molton.

Source : WordNet®

calving
     n : giving birth to a calf