The headword is feminine nominative singular of the adjective lisso/s. It is glossed here as in the scholia to Homer, Odyssey 5.412, where it appears (in reference to a rock); see web address 1. Similar glosses in other lexica, including Apollonius' Homeric Lexicon, and in a scholion on Apollonius Rhodius, Argonautica 2.382, where the adjective occurs in the dative, referring to an island (web address 2).