■ noun
1》 a large, ugly, and frightening imaginary creature.
↘an inhumanly cruel or wicked person.
↘ humorous a rude or badly behaved child.
2》 a congenitally malformed or mutant animal or plant.
3》 [as modifier ] informal extraordinarily large.
■ verb Brit. informal criticize severely.
Origin
ME: from OFr. monstre , from L. monstrum 'portent or ~', from monere 'warn'.