The headword (a single word in the Greek), here nominative singular, is in Attic dialect (with tt). For its counterpart qh=ssa see already theta 365, and generally LSJ under qh/s. The entry itself has rememblances to ones in other lexica, e.g. Photius theta172 Theodoridis., but this is more specific.
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"The daughter of a man in the thetic class who survived him and would thus have been an [heiress] if there had been any estate to inherit was known as a qh=ssa and was the subject of special provisions which are set out in full in Demosthenes, Makartatos [Demosth. 43.54]. Her nearest male kinsman was required either to marry her himself or to dower her; the dowry was fixed by the census class to which the man belonged, 500 drachmai if he was a pentakosiomedimnos, 300 if he was a knight, 150 if he was a zeugite" (A.R.W. Harrison, The Law of Athens, i (Oxford 1969) 135-6).