thallus thallous • thalmencephalon · · · Info · Definitions · Characters · · thallus · · Text Latin · · Script 7 · · Length 2 · · Syllables Definitions · · · (noun) a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes. · · Noun Definition 1 Characters · · a latin small letter a U+0061 h latin small letter h U+0068 l latin small letter l U+006C s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075