fù​qí

ventral fin (fish)

腹鳍 腹鰭 fù​qí
ventral fin (fish)
one of the paired fins on the belly of a fish used for steering and maintaining balance; equivalent to the hind limbs of higher vertebrates
ventral fin (aircraft)
a stabilizing surface on the underside of an aircraft fuselage used to increase directional stability

Frequency

Written text
0.043 per million

Sources

Frequency data
BCC Corpus (BLCU)