Technology / Home Audio / Hum Components: The residual artifact harmonics of the AC power supply. In the U.S. the use a 60-Hz system, places the most annoying 2nd and 3rd harmonics at 120 Hz and 180 Hz. For Europe, and other parts of the world using 50-Hz mains, these components fall at 100 Hz and 150Hz. To some extent, this is present with nearly all non automotive sound systems and is generally accounted as noise.
Hum Verb Synonyms: bustle, stir, be active, move briskly, tick (over)
Hum Noun Synonyms: buzz, drone, thrum, murmur, whirr, purr, vibrate, bombinate or bombilate
Science / Geology / Humus: The dark portion of a soil that consists of organic material that is well enough decayed that the original source material can not be identified. MORE
Entertainment / Literature / Humors: (alias bodily humors) In ancient Greece, Hippocrates postulated that four bodily humors or liquids existed in the body corresponding to the four elements existing in matter. These four liquids determi MORE