shortened by or as if by having a part cut off; cut short

an unnecessarily truncated essay.

(of a geometric figure or solid) having the apex, vertex, or end cut off by a plane

a truncated cone or pyramid.

Crystallography . (of a crystal) having corners, angles, or edges cut off or replaced by a single plane.

Biology . truncate ( def. 4 ) .

Prosody . (of a line of verse) lacking at the beginning or end one or more unstressed syllables needed to fill out the metrical pattern.