Terminators

noun

1. Someone who terminates or ends something, especially (in later use) an assassin or exterminator.
2. The line between the day side and the night side of a moon, planet or other celestial body.
3. A DNA sequence which causes RNA transcription to cease and an mRNA transcript to break off.
4. An electrical device that absorbs reflection at the end of a transmission line.
5. An intelligent android created to destroy humans (after the 1984 film The Terminator).