The headword is an adjective (tmhtiko/s, -h/, o/n(/) given here in the masculine nominative singular; see LSJ s.v. and cf. cognates at tau 712, tau 713, tau 714, tau 715, tau 716, and tau 718. An instance of the lemma is at ps.-Herodian, Partitiones 134.5 (Boissonade).
[1] The gloss is the present active participle, masculine nominative singular (cutting/hewing/slaughtering), of the verb te/mnw, I cut/hew/slaughter; see LSJ s.v. Without the substantive that agrees directly with the participle, but accompanied by the article, the gloss as a whole substantivizes the (attributive) participle that it contains (Smyth, 2049-50).
See also tau 755, and under epsilon 180.