tooth

A hard, calcareous structure present in the mouth of many vertebrate animals, generally used for biting and chewing food.

A sharp projection on the blade of a saw or similar implement.

A projection on the edge of a gear that meshes with similar projections on adjacent gears, or on the circumference of a cog that engages with a chain.

Jute has more tooth than polypropylene.

Of a rope, the stickiness when in contact with another rope as in a knot.

Species XXXVI. Obliquaria bullata— (Unio bullata) […] Found at the falls of Ohio; rare; breadth almost two inches; cardinal and lamellar teeth like preceding species; apices rounded, decorticated, but not truncated

1832, Constantine Samuel Rafinesque, A monograph of the fluviatile bivalve shells of the river Ohio, page 43:

(zoology) A projection or point in other parts of the body resembling the tooth of a vertebrate animal.

(botany) A pointed projection from the margin of a leaf.

(animation) The rough surface of some kinds of cel or other films that allows better adhesion of artwork.

I have a sweet tooth: I love sugary treats.

These are not dishes for thy dainty tooth

1693, John Dryden, “The Third Satire of Aulus Persius Flaccus”, in The Satires of Decimus Junius Juvenalis:

(figurative) Liking, fondness (compare toothsome).

(algebraic geometry) An irreducible component of a comb that intersects the handle in exactly one point, that point being distinct from the unique point of intersection for any other tooth of the comb.

hammas

botany: pointed projection from the margin of a leaf

Wales (usually), Midlands (especially Birmingham)

From Middle English tothe, toth, tooth, from Old English tōþ (“tooth”), from Proto-West Germanic *tanþ, from Proto-Germanic *tanþs (“tooth”), from Proto-Indo-European *h₃dónts (“tooth”). Related to tusk. Doublet of dent, dens, tind, and tine.
Cognates
Cognate with Scots tuth, tuith (“tooth”), North Frisian toth, tos (“tooth”), Dutch tand (“tooth”), Low German Tähn (“tooth”), German Zahn (“tooth”), Danish tand (“tooth”), Swedish tand (“tooth”), Norwegian tann (“tooth”), Icelandic tönn (“tooth”), Welsh dant (“tooth”), Latin dēns (“tooth”), Lithuanian danti̇̀s (“tooth”), Ancient Greek ὀδούς (odoús)/ὀδών (odṓn, “tooth”), Armenian ատամ (atam), Persian دندان (dandân), Sanskrit दत् (dát), दन्त (danta, “tooth”).


tooth

His Wife sate near him, teasing matted wool, / While, from the twin cards toothed with glittering wire / He fed the spindle […]

to tooth a saw

Whereas if the Header of one side of the wall, toothed as much as the Stretcher on the other side, it would be a stronger Toothing, and the joints of the Header on one side, would be in the middle of the Headers of the course they lie upon of the other side

1678, Joseph Moxon, Mechanick Exercises: or the Doctrine of Handy-works, page 260:

To lock into each other, like gear wheels.

en-verb

tooth (third-person singular simple present tooths, present participle toothing, simple past and past participle toothed)

tooths (present singular third-person)
toothing (participle present)
toothed (participle past)
toothed (past)