I. ˈmän(t)-stər noun
Etymology: Middle English monstre, from Anglo-French, from Latin monstrum omen, monster, from monēre to warn — more at mind
Date: 14th century
1.
a. : an animal or plant of abnormal form or structure
b. : one who deviates from normal or acceptable behavior or character
2. : a threatening force
3.
a. : an animal of strange or terrifying shape
b. : one unusually large for its kind
4. : something monstrous ; especially : a person of unnatural or extreme ugliness, deformity, wickedness, or cruelty
5. : one that is highly successful
II. adjective
Date: 1837
: enormous or impressive especially in size, extent, or numbers