Definition of protohaem in English:

protohaem

(also protoheme)

noun

Biochemistry
  • A haem complex containing a protoporphyrin bonded ionically to a ferrous iron (Fe2+) cation.

Origin

1930s; earliest use found in Chemical Abstracts. From proto- + haem, after German Protohäm.

Pronunciation

protohaem

/ˈprəʊtəʊhiːm/