The headword is a two-ending adjective in the masculine and feminine nominative singular; see generally LSJ s.v. Early attestations are Ibycus fr. 36b and Pindar, Pythian Odes 5.111 (web address 1), but see n. 1 below (end). [In her critical apparatus Adler reports that in ms V this entry follows tau 88.]
For compounds with tanu-, see also tau 83, tau 84, tau 85, tau 86, tau 88.
[1] Identical glossing in the Synagoge (tau30), Photius' Lexicon (tau48 Theodoridis), and Etymologicum Magnum 745.48 (Kallierges); cf. Hesychius tau150. (Adler also cites Boysen's Lexicon Seguerianum.) Apollonius' Homeric Lexicon has a very similar gloss on the lemma (149.22). Thus, despite the belief of Adler and, now, Theodoridis that the headword is quoted from Pindar (see above), the entry might actually be generated by Homeric instances of the headword's epic/Aeolic spelling tanupte/ruc: the dative plural tanupteru/gessi at Iliad 12.237 (web address 2) and the dative singular tanupte/rugi at Iliad 19.350 (web address 3); cf. Cunliffe, p. 373.