Appearing in LSJ, with no apparent textual or morphological justification, under the form ἐπαύλιος , the headword is an adjective that could theoretically modify 'road' or any of a number of other nouns. Unfortunately, it is unattested outside of this entry and the derivative entry of ps.-Zonaras 797.8 -- unless we read as a single word the transmitted phrase ἐπ' αὐλείοισι at Aristophanes, Wasps 1482 (Web address 1), where the dative plural noun modified is θύραις ('doors').