tirtis

Etymology
If we assume the initial t was previously k:
 * Could be from original *kirv-, with progressive k>t, v>t. Compare 🇨🇬, 🇨🇬, from, from.
 * Could be from original *kirt-. Compare 🇨🇬, from the same root as above.

Noun

 * 1)  axe, hatchet