noun
- any of a series of teeth on the rim of a wheel, for transmitting or receiving motion by fitting between the teeth of another wheel; gear tooth
- a cogwheel
- ☆ a person or thing regarded as a minor but necessary part of the structure of an activity or organization
Origin:
ME cog, cogge < ? Scand, as in Norw kug, Swed kugge, a cog, tooth < IE *gugā a hump, ball < base *gēu-, to bend, arch > OE cycgel, cudgel