subsoil subsocial • subsoiler · · · Info · Definitions · Synonyms · Characters · · subsoil · · Text Latin · · Script 7 · · Length 2 · · Syllables Definitions · · · (noun) the layer of soil between the topsoil and bedrock. Synonyms: undersoil. · · Noun Definition 1 Synonyms · · · undersoil · · Synonym 1 Characters · · b latin small letter b U+0062 i latin small letter i U+0069 l latin small letter l U+006C o latin small letter o U+006F s latin small letter s U+0073 u latin small letter u U+0075