underseal undersea • undersealed · · · Info · Definitions · Synonyms · Characters · · underseal · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) seal consisting of a coating of a tar or rubberlike material on the underside of a motor vehicle to retard corrosion. Synonyms: undercoat. · · Noun Definition 1 Synonyms · · · undercoat · · Synonym 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 l latin small letter l U+006C n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073 u latin small letter u U+0075