名詞 ratite:

1. flightless birds having flat breastbones lacking a keel for attachment of flight muscles: ostriches; cassowaries; emus; moas; rheas; kiwis; elephant birds
   同義詞：ratite bird, flightless bird

rat.ite

adj.（形容詞）
Relating to or being any of a group of flightless birds having a flat breastbone without the keellike prominence characteristic of most flying birds.
平胸鳥(niǎo)的：與一種平胸，沒(méi)有一般飛翔性鳥(niǎo)類(lèi)所特有的龍骨狀突起的不會(huì)飛的鳥(niǎo)有關(guān)的；屬于這一類(lèi)鳥(niǎo)的
n.（名詞）
A ratite bird, such as the ostrich or emu.
平胸鳥(niǎo)：平胸鳥(niǎo)，如鴕鳥(niǎo)和鶴鴕

來(lái)源：
From Latin ratotus [marked with the figure of a raft]
源自 拉丁語(yǔ) ratotus [具有浮排形特征的]
from ratis [raft]
源自 ratis [浮排]