dens

Dens, dentis, m., third declension and an i-stem, so the genitive plural is dentium and never dentum. Masculine, despite a nominative that looks as though it ought to be feminine; the gender has to be learned rather than guessed.

It names anything tooth-shaped as readily as it names a tooth: the fluke of an anchor, the tine of a rake, the cutting edge of a saw or a plough. Dens leonis, "lion's tooth", is the dandelion, named for its jagged leaves and carried into English through French dent-de-lion. The Latin word and English tooth descend from the same ancient root by the regular consonant shift, so they are cousins rather than a borrowing. English also took dental, dentist, indent and trident.