|Origin:||monstre, from Latin monstrum 'warning, monster', from monere 'to warn'|
an imaginary or ancient creature that is large, ugly, and frightening:
the remains of a prehistoric monster
the search for the Loch Ness Monster
someone who is very cruel and evil:
Only a monster could kill all those women.
a small child, especially one who is behaving badly - used humorously:
I've got to get home and feed this little monster.
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!
a dangerous or threatening problem, especially one that develops gradually and is difficult to manage