Entry 1 sense Webster, 1913 Gelatinous /jə-lăt′ĭn-əs/ · Ge·lat·i·nous · IPA /d͡ʒəˈlæt.ɪn.əs/ 01 a. Of the nature and consistence of gelatin or the jelly; resembling jelly; viscous. 1. Of the nature and consistence of gelatin or the jelly; resembling jelly; viscous.