Dictionary
ter•mi•na•tor
Pronunciation: (tûr'mu-nā"tur), [key]—
n.
1. a person or thing that terminates.
2. Astron.the dividing line between the illuminated and the unilluminated part of a satellite or planet, esp. the moon.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.