hard bonelike structures in the jaws of vertebrates; used for biting and chewing or for attack and defense
"The dog bared its sharp teeth to threaten the intruder."
something resembling the tooth of an animal
"The jagged edge of the broken glass reminded me of a bear's tooth."
toothlike structure in invertebrates found in the mouth or alimentary canal or on a shell
"The fossilized specimen revealed a series of sharp, toothlike structures lining the animal's ancient shell."
one of a number of uniform projections on a gear
"The machine operator inspected each tooth on the large industrial gear to ensure they were not worn down by friction."
A hard, calcareous structure present in the mouth of many vertebrate animals, generally used for eating.
"The shark's sharp tooth sliced through the fish with ease during its hunt."
In plain English: A tooth is a hard, white part of your mouth that helps you bite and chew food.
"I need to brush my teeth before bed."
Usage: Use this word to refer specifically to a single unit within your set rather than using it as a synonym for "teeth" when speaking about multiple structures. When describing the act of equipping something with sharp edges, use the verb form only in technical contexts like manufacturing or biology.
To provide or furnish with teeth.
"The mechanic had to replace the old belt and then re-tooth the pulleys so they would align correctly again."
In plain English: To tooth means to put sharp points on something, usually by attaching small metal spikes.
"The dog began to tooth its way through the fence while chasing the squirrel."
The word "tooth" comes from Old English, where it originally meant the hard projection used for biting or tearing. It is related to the word "tusk."