D defs.my
Entry 2 senses Webster, 1913

Reflector

/(-ẽr)/ · Re·flect·or · IPA /ɹɪˈflɛktə(ɹ)/
01 n. One who, or that which, reflects.
  1. 1.
    One who, or that which, reflects.
  2. 2.
    Something having a polished surface for reflecting light or heat, as a mirror, a speculum, etc.(Physics)