·noun One who, or that which, terminates.
II. Terminator ·noun The dividing line between the illuminated and the unilluminated part of the moon.
termĭnātor, ōris, m. [termino], he who limits , sets bounds , Aug. Civ. Dei, 4, 11. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
The line separating the illuminated from the dark portion of the moon's disc. ...
The Sailor's Word-Book