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. One who, or that which, hums; one who applauds by humming. 2. A humming bird.(Zool.)