flightless bird

Từ điển WordNet v3.1 - WordNet Dictionary

noun

flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches;
cassowaries;
emus;
moas;
rheas;
kiwis;
elephant birds
• Syn:
ratite, ratite bird
• Ant:
carinate (for: ratite)
• Hypernyms:
bird
• Hyponyms:
ostrich, Struthio camelus, cassowary, emu, Dromaius novaehollandiae,
Emu novaehollandiae, kiwi, apteryx, rhea, Rhea americana, nandu,
Pterocnemia pennata, elephant bird, aepyornis, moa