n.
1.flat surface that rotates and pushes against air or water
2.mechanical device attached to an elevated structure
3.a metal fin attached to the tail of a bomb or missile in order to stabilize or guide it
4.the flattened weblike part of a feather consisting of a series of barbs on either side of the shaft
Idiom of the Day
break off (something) or break (something) off
to discontinue something, to terminate something
The two countries broke off their relations.