The Collaborative International Dictionary of English v.0.48:

Culver \Cul"ver\ (k?"v?r), n. [AS. culfre, perh. fr. L.
   columba.]
   A dove. "Culver in the falcon's fist." --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Culver \Cul"ver\, n. [Abbrev. fr. Culverin.]
   A culverin.
   [1913 Webster]

         Falcon and culver on each tower
         Stood prompt their deadly hail to shower. --Sir W.
                                                  Scott.
   [1913 Webster]