sawtooth

noun

1. A tooth of a saw: any of its series of projections, each with a cutting edge.

   “Holonyms: sawblade < saw”

2. (attributive, often)Something else that is shaped like such a tooth (for example, a roof or each peaked portion thereof; a curve or waveform on a graph).
3. A sawtooth wave.
4. Any of various pierid butterflies of the genus Prioneris.
5. A pattern whose living cell population reaches new peaks infinitely many times before dropping to a fixed value after each peak.
6. The military barracuda, Sphyraena putnamae.