D defs.my
Entry 2 senses Webster, 1913

Terminator

/tẽrm'-ən-ātˌ-ẽr/ · Ter·mi·na·tor · IPA /ˈtɝ.mɪˌneɪ.tɚ/
01 n. One who, or that which, terminates.
  1. 1.
    One who, or that which, terminates.
  2. 2.
    The dividing line between the illuminated and the unilluminated part of the moon.(Astron.)