1. [v]  birth; of certain mammals
2. [v]  release ice; of icebergs or glaciers

CALVE is a 5 letter word that starts with C.

1. \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.
   
   

2. \Calve\, v. i. (Phys. Geog.)
   To throw off fragments which become icebergs; -- said of a
   glacier.