I. mon ‧ ster 1 /ˈmɒnstə $ ˈmɑːnstər/ BrE AmE noun [countable]
[ Date: 1200-1300 ; Language: French ; Origin: monstre , from Latin monstrum 'warning, monster' , from monere 'to warn' ]
1 . IN STORIES an imaginary or ancient creature that is large, ugly, and frightening:
the remains of a prehistoric monster
the search for the Loch Ness Monster
2 . CRUEL PERSON someone who is very cruel and evil:
Only a monster could kill all those women.
3 . CHILD a small child, especially one who is behaving badly – used humorously:
I’ve got to get home and feed this little monster.
4 . SOMETHING LARGE informal an object, animal etc that is unusually large:
Did you see the fish Dad caught? It was a monster!
There’s a monster of a spider in the bath!
5 . DANGEROUS PROBLEM a dangerous or threatening problem, especially one that develops gradually and is difficult to manage
II. monster 2 BrE AmE adjective [only before noun]
informal unusually large SYN giant :
a monster cat
The song was a monster hit.