heme
UK[hiːm]US[hiːm]
n
The deep red, non-protein, iron-containing component of hemoglobin and myoglobin.
Etymology
The term 'heme' has a direct lineage tracing back to the ancient Greek word 'haima', meaning blood. This root is widely present in scientific and medical vocabulary, such as in 'hemoglobin' and 'hemorrhage', consistently relating to blood. The specific chemical term was shortened in the 20th century from 'haematin', a derivative referring to the blood pigment. Thus, the modern, concise term 'heme' retains its fundamental semantic link to its bloody origin, now precisely denoting the iron-rich, oxygen-carrying compound central to vertebrate life.
Analysis
The word 'heme' is a simplex form. It is a shortened form of 'haematin', which itself derives from the Greek word 'haima' (αἷμα), meaning 'blood'. Its functional role is as a complete lexical unit.
Examples
Heme is the pigment that gives blood its characteristic red color.
The iron atom at the center of the heme group binds to oxygen.
A deficiency in heme synthesis can lead to certain types of anemia.