ratite

名词 ratite:

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

rat.ite

adj.（形容词）
Relating to or being any of a group of flightless birds having a flat breastbone without the keellike prominence characteristic of most flying birds.
平胸鸟的：与一种平胸，没有一般飞翔性鸟类所特有的龙骨状突起的不会飞的鸟有关的；属于这一类鸟的
n.（名词）
A ratite bird, such as the ostrich or emu.
平胸鸟：平胸鸟，如鸵鸟和鹤鸵

来源：
From Latin ratotus [marked with the figure of a raft]
源自 拉丁语 ratotus [具有浮排形特征的]
from ratis [raft]
源自 ratis [浮排]