Monster Mon"ster, n. [OE. monstre, F. monstre, fr. L. monstrum, orig., a divine omen, indicating misfortune; akin of monstrare to show, point out, indicate, and monere to warn. See {Monition}, and cf. {Demonstrate}, {Muster}.] 1. Something of unnatural size, shape, or quality; a prodigy; an enormity; a marvel. [1913 Webster]

A monster or marvel. --Chaucer. [1913 Webster]

2. Specifically, an animal or plant departing greatly from the usual type, as by having too many limbs. [1913 Webster]

3. Any thing or person of unnatural or excessive ugliness, deformity, wickedness, or cruelty. [1913 Webster]

The Collaborative International Dictionary of English. 2000.