Source : Webster's Revised Unabridged Dictionary (1913)

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