The headword, extracted from the quotation given, is second person plural, aorist indicative, of the verb tima/omai, which takes a genitive and means 'to estimate/value' (see LSJ s.v. 2 at web address 1). For this verb cf. epsilon 3317, epsilon 3318, epsilon 3319; also tau 628 and tau 629.
[1] An approximation of Thucydides 1.33.2 (the original is h(\n u(mei=s a)\n pro\ pollw=n xrhma/twn kai\ xa/ritos e)timh/sasqe du/namin u(mi=n prosgene/sqai, "which you would have valued above much material and moral strength"; see web address 2), preceded by the gloss of the scholia there.