c. 1300, "wheel having teeth or cogs;" late 14c., "tooth on a wheel," probably a borrowing from a Scandinavian language (compare Norwegian kugg "cog") and cognate with Middle High German kugel "ball."
Entries linking to cog
cog-wheel n.
"wheel having teeth or cogs," early 15c., from cog (n.) + wheel (n.).
kugel n.
kind of pudding in Jewish cookery, 1846, from Yiddish kugel, literally "ball," from Middle High German kugel "ball, globe" (see cog (n.)).