To catapult is defined as to forcefully throw something.(verb)
When you forcefully throw your book across the room, this is an example of a time when you catapult the book across the room.
The definition of a catapult is a military machine or other device that launches something with great force.(noun)
A machine that can hurl something a far distance with great force is an example of a catapult.
See catapult in Webster's New World College Dictionary
Origin: L catapulta < Gr katapeltēs < kata-, down, against + base of pallein, to toss, hurl
See catapult in American Heritage Dictionary 4
Origin: French catapulte
Origin: , from Old French
Origin: , from Latin catapulta
Origin: , from Greek katapaltēs
Origin: : kata-, cata-
Origin: + pallein, to brandish, poise a weapon before hurling; see pāl- in Indo-European roots.
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