• WordNet 3.6
    • n boatbill tropical American heron related to night herons
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Webster's Revised Unabridged Dictionary
    • Boatbill A perching bird of India, of the genus Eurylaimus.
    • Boatbill A wading bird (Cancroma cochlearia) of the tropical parts of South America. Its bill is somewhat like a boat with the keel uppermost.
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Century Dictionary and Cyclopedia
    • n boatbill A South American bird, Cochlearia (or Cancroma) cochlearia, related to the true herons: so named from the shape and size of the bill, which is very broad and much vaulted. The boatbill is about the size of and somewhat resembles a night-heron (apart from the bill), but is the type of a distinct subfamily, Cancrominœ (which see). Also called boat-billed heron and savacou.
    • n boatbill One of the broadbills, Eurylæmidæ, a group of perching birds characteristic of the Indo-Malayan region; in particular, Cymbirhynchus macrorhynchus. See cut under gaper.
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In literature:

Parker, in his notes upon the osteology of the balaeniceps, this bird recalls the boatbill, the heron, and the adjutant.
"Scientific American Supplement, No. 829, November 21, 1891" by Various
Of the genus Cancroma one specimen was procured, the cinereous boatbill, which was killed at the senote at Chichen.
"Incidents of Travel in Yucatan, Vol. II." by John L. Stephens