The headword is the (masculine and) feminine accusative plural of the noun tanu/pous; cf. generally LSJ s.v. The lemma is an epithet of the Erinyes, vengeful deities whose aid Ajax attempts to invoke at Sophocles, Ajax 837 (web address 1); cf. alpha 632 (end). The entry is evidently generated by that passage, or its corresponding scholia (vetera), which the end of the entry follows. [Bernhardy proposed singular fhsi/, he is saying, for the Suda's plural.]
For compounds with tanu-, see also tau 83, tau 84, tau 86, tau 87, and tau 89. [As Adler notes in her critical apparatus, the entry should follow tau 86 in lexicographical order.]
[1] The headword is similarly glossed by Hesychius s.v., which notes that the Erinyes' vengeance is swift; cf. Photius' Lexicon (tau46 Theodoridis) and Etymologicum Magnum 745.34 (Kallierges). On the Erinyes, see also epsilon 2994, epsilon 2995, epsilon 3580, epsilon 3581, and OCD(4) s.v.