haem Haeckelism • Haemamoeba · · · Info · Definitions · Synonyms · Characters · · haem · · Text Latin · · Script 4 · · Length Definitions · · · (noun) a complex red organic pigment containing iron and other atoms to which oxygen binds. Synonyms: heme, hematin, haemitin, protoheme. · · Noun Definition 1 Synonyms · · · heme · · Synonym 1 hematin · · Synonym 2 haemitin · · Synonym 3 protoheme · · Synonym 4 Characters · · a latin small letter a U+0061 e latin small letter e U+0065 h latin small letter h U+0068 m latin small letter m U+006D