any of various bonelike structures set in the jaws of most vertebrates and modified, according to the species, for biting, tearing, or chewingRelated: dental
2.
any of various similar structures in invertebrates, occurring in the mouth or alimentary canal
3.
anything resembling a tooth in shape, prominence, or function: the tooth of a comb
4.
any of the various small indentations occurring on the margin of a leaf, petal, etc
5.
any one of a number of uniform projections on a gear, sprocket, rack, etc, by which drive is transmitted
6.
taste or appetite (esp in the phrase sweet tooth)
7.
long in the tooth old or ageing: used originally of horses, because their gums recede with age
8.
tooth and nail with ferocity and force: we fought tooth and nail
—vb
9.
(tr) to provide with a tooth or teeth
10.
(intr) (of two gearwheels) to engage
Related: dental
[Old English tōth; related to Old Saxon tand, Old High German zand, Old Norse tonn, Gothic tunthus, Latin dens]
late 14c., in literal sense, from tooth + -less. Figurative sense of "dull" is recorded from 1590s; that of "lacking enforcement powers" is first recorded 1961.