D defs.my
Entry 2 senses Webster, 1913

Opener

/ōp'-ən-ẽr/ · O·pen·er · IPA /ˈoʊ.pən.ɚ/
01 n. One who, or that which, opens.
  1. 1.
    One who, or that which, opens.
  2. 2.
    A bottle opener or a can opener; as, you need an opener to get the cap off.