Terminator

The word terminator is from Latin and means roughly the finisher.

1) In astronomy, the terminator is the line between the day side and the night side of a planetary body. Examination of the terminator can yield information about the surface of the body; for example, a fuzzy terminator indicates the presence of an atmosphere.

2) In genetics, a terminator marks the end of a gene on the DNA for transcription.

3) The Terminator is a movie, in which the bad cyborg terminates (ends) lives.