1) Cutting-edge feature 2) Having serrations 3) Mountain range in Idaho 4) Serrate 5) Serration 
[cellular automaton] In a cellular automaton, a finite pattern is called a sawtooth if its population grows without bound but does not tend to infinity. In other words, a sawtooth is a pattern with population that reaches new heights infinitely often, but also infinitely often drops below some fixed value. Their name comes from the fact tha...
• (n.) An arctic seal (Lobodon carcinophaga), having the molars serrated; -- called also crab-eating seal.
<radiobiology> When a tokamak runs with enough current to achieve q < 1 on the magnetic axis, the plasma parameters (n, T, B) oscillate with a sawtooth waveform. The oscillation is localised to a region roughly within the q=1 surface, and arises from internal magnetohydrodynamic effects. Confinement is degraded within the sawtooth region.
Saw'tooth` noun (Zoology) An arctic seal ( Lobodon carcinophaga ), having the molars serrated; -- called also crab-eating seal . 
[n] - a serration on a saw blade
noun a serration on a saw blade