[500] μάστι from the stem “μαστι^”- of which “μαστιγ”- = “μαστι^-ιγ-” is a derivative. It recurs in Greek only Od. 15.182 “μάστιν”. The verbs “μαστίω” (17.622, 20.171) and “μαστίζω” answer to the two stems. Cf. “ὄρνι^ς” beside “ὄρνι<*>σ῀ὄρνι-ιθ-ς”: and for the form of the dat. “κνήστι” 11.640, 18.407. “ κατωμαδόν ” as 15.352.