D defs.my
Entry 2 senses Webster, 1913

Hummer

/hŭm'-ẽr/ · Hum·mer · IPA /ˈhʌmɚ/
01 n. One who, or that which, hums; one who applauds by humming.
  1. 1.
    One who, or that which, hums; one who applauds by humming.
  2. 2.
    A humming bird.(Zool.)