The Collaborative International Dictionary of English v.0.48:

Cypseliform \Cyp*sel"i*form\ (s?p-s?l"?-f?rm), a. [L. cypselus a
   kind of swallow, Gr. ???? + -form.] (Zool.)
   Like or belonging to the swifts (Cypselid[ae].)
   [1913 Webster]