terminator

noun

1. 1

   Someone who terminates or ends something, especially (in later use) an assassin or exterminator.

2. 2

   The line between the day side and the night side of a moon, planet or other celestial body.

3. 3

   A DNA sequence which causes RNA transcription to cease and an mRNA transcript to break off.

4. 4

   An electrical device that absorbs reflection at the end of a transmission line.

5. 5

   An intelligent android created to destroy humans (after the 1984 film The Terminator).