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