• (a.) Having the bill cleft beyond the horny part, as in the case of swallows and goatsuckers.
Fis`si·ros'tral adjective [ Confer French fissirostre .] (Zoology) Having the bill cleft beyond the horny part, as in the case of swallows and goatsuckers. 
fissirostral 1. Having a broad, deeply cleft beak, or bill; such as, swallows and goatsuckers. 2. With reference to a bird's beak, deeply cleft.
having a broad, deeply cleft beak or bill, as the swallows and goatsuckers. · (of the bill) deeply cleft.