protoheme protohematoblast • protohemin · · · Info · Definitions · Synonyms · Characters · · protoheme · · Text Latin · · Script 9 · · Length 3 · · Syllables Definitions · · · (noun) a complex red organic pigment containing iron and other atoms to which oxygen binds. Synonyms: heme, haem, hematin, haemitin. · · Noun Definition 1 Synonyms · · · heme · · Synonym 1 haem · · Synonym 2 hematin · · Synonym 3 haemitin · · Synonym 4 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 m latin small letter m U+006D o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074