εἰκοστή Save εἰκοστή, tax of a twentieth Could not find εἰκοστῆς in Logeion dictionaries. εἰκοστῆς Noun: feminine genitive singular of εἰκοστή εἰκοστῆς Adjective: feminine genitive singular of εἰκοστός See εἰκοστῆς in Morpho LSJ Middle Liddell εἰκοστή, ἡ, v. εἰκοστός ΙΙ. εἰκοστή v. εἰκοστός II.