| Fissirostral | a. [ Cf. F. fissirostre. ] (Zool.) Having the bill cleft beyond the horny part, as in the case of swallows and goatsuckers. [ 1913 Webster ] |
| Fissirostres | ‖n. pl. [ NL., fr. L. fissus (p. p. of findere to cleave) + rostrum beak. ] (Zool.) A group of birds having the bill deeply cleft. [ 1913 Webster ] |