Definition of grenades:
(n) :
A small explosive device, designed to be thrown by hand or launched using a rifle, grenade launcher, or rocket.
(v) :
(motor racing, slang, intransitive) Of an engine: to be violently wrecked so that the internal components burst out.
(n) :
(slang) An unattractive girl.
(n) :
(heraldry) A charge similar to a fireball, and made of a disc-shaped bomb shell, but with only one set of flames at the top.
(v) :
To use grenade(s) upon.
(n) :
(obsolete) A pomegranate.