perithelium perithelioma • perithoracic · · · Info · Definitions · Characters · · perithelium · · Text Latin · · Script 11 · · Length 5 · · Syllables Definitions · · · (noun) tissue layer around small blood vessels. · · Noun Definition 1 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075