n. & v.
n. 1 a cylindrical projectile that can be propelled to a great height or distance by combustion of its contents, used esp. as a firework or signal. 2 an engine using a similar principle but not dependent on air intake for its operation. 3 a rocket-propelled missile, spacecraft, etc. 4 Brit. sl. a severe reprimand.
v. (rocketed, rocketing) 1 tr. bombard with rockets. 2 intr. a move rapidly upwards or away. b increase rapidly (prices rocketed).
[ F roquette f. It. rochetto dimin. of rocca ROCK(2), with ref. to its cylindrical shape ]