The Collaborative International Dictionary
Egg-bird
Egg-bird \Egg"-bird`\, n. (Zo["o]l.) A species of tern, esp. the sooty tern ( Sterna fuliginosa) of the West Indies. In the Bahama Islands the name is applied to the tropic bird, Pha["e]thon flavirostris.
Wiktionary
egg-bird
n. (context dated English) A species of tern, especially the sooty tern ((taxlink Onychoprion fuscatus) species noshow=1)) of the West Indies or, in the Bahamas, ''Phaethon lepturus''.