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/