having a broad, deeply cleft beak or bill, as the swallows and goatsuckers.
(of the bill) deeply cleft.
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British Dictionary definitions for fissirostral
(of the beaks of some birds) broad and deeply cleft
having such a beak, as swifts and swallows
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012