The headword -- a single word in the Greek -- is an adverb derived from te/mnw, I cut, I hew, I wound; see LSJ s.v. It occurs at Homer, Iliad 7.262 (web address 1): with the thrust of his spear, Telamonian Ajax (alphaiota 9 and OCD(4) s.v. Aias) pierces Hector's (epsilon 683 and OCD(4) s.v.) shield so as to cut his neck.
[1] The glossing adverb is cognate with the adjective tmhtiko/s, -h/, -o/n, able to cut; see LSJ s.v. Besides the scholia to the Homeric passage (above), the headword is identically glossed in the Synagoge and Photius' Lexicon; cf. ps.-Zonaras (Tittmann) 1736.12, Etymologicum Genuinum, and Hesychius. Adler also cites Lexicon Ambrosianum 485.