means A small handheld brush with bristles on one end, used with toothpaste to clean the teeth and gums.

from A plain compound of "tooth" and "brush," both solidly English — "tooth" from Old English tōþ (a cousin of Latin dens and Greek odous, all from a deep Indo-European root for the biting thing in your mouth), and "brush" from Old French broce, a bundle of twigs or bristles. The bristled object came before the word: people scrubbed their teeth with chew-sticks and frayed twigs for ages, but the proper bristle-on-a-handle design is often credited to China, and the English word "toothbrush" is recorded from around the turn of the 17th century — the moment the contraption finally earned a name as literal as it is unloved.