Merriam-Webster's Collegiate® Dictionary, 11th Edition
MONSTER
I. noun see: mind
Date: 14th century
1. an animal or plant of abnormal form or structure, one who deviates from normal or acceptable behavior or character, a threatening force,
3. an animal of strange or terrifying shape, one unusually large for its kind, something monstrous, one that is highly successful,
II. adjective
Date: 1837
enormous or impressive especially in size, extent, or numbers