Dictionary.com
Thesaurus.com

fissirostral

American  
[fis-uh-ros-truhl] / ˌfɪs əˈrɒs trəl /

adjective

Ornithology.
  1. having a broad, deeply cleft beak or bill, as the swallows and goatsuckers.

  2. (of the bill) deeply cleft.


fissirostral British  
/ ˌfɪsɪˈrɒstrəl /

adjective

  1. (of the beaks of some birds) broad and deeply cleft

  2. 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

Etymology

Origin of fissirostral

fissi- + rostral