One of the mysteries of the English language finally explained.
Any of a group of fifteen isomeric porphyrins having the formula C₃₄H₃₄N₄O₄, in which the porphin nucleus has four methyl, two vinyl, and two propionic acid substituents; especially (more fully "protoporphyrin IX") the isomer which occurs widely in living organisms, mainly as haem (in which it is bonded to an iron atom).
1920s; earliest use found in Chemical Abstracts. From proto- + porphyrin, after German Protoporphyrin.
In this article we explore how to impress employers with a spot-on CV.