a person or thing that terminates.
Astronomy. the dividing line between the illuminated and the unilluminated part of a satellite or planet, especially the moon.

1760–70; < Late Latin terminātor, equivalent to terminā(re) to terminate + -tor -tor

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World English Dictionary
terminator (ˈtɜːmɪˌneɪtə)
the line dividing the illuminated and dark part of the moon or a planet

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1770, "line of separation between the bright and dark parts of a moon or planet," from L. terminator, from terminare (see terminus). Meaning "one who terminates (something)" is attested from 1846.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

terminator definition

A resistor connected to a signal wire in a bus or network for the purpose of impedance matching to prevent reflections.
For example, a 50 ohm resistor connected across the end of an Ethernet cable. SCSI chains and some LocalTalk wiring schemes also require terminators.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Even my boyfriend's dad wants one for his, he works and he is an ex-terminator and he wants to use it to check for bedbugs.
At the poles, a line drawn across the moon that connects the terminator ends runs perpendicular to the horizon.
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