Noun

The component of haemoglobin responsible for binding oxygen, consists of an iron ion that binds oxygen and a porphyrin ring that binds the globin molecules; one molecule binds one molecule of oxygen.

*2010 , Pierre Cornelis and Simon Andrews (editors), Iron Uptake and Homeostasis in Microorganisms , page 17:

*:Haem' is ubiquitous, abundant and necessary for energy metabolism. Most bacteria have a '''haem''' biosynthesis pathway, but nevertheless, since '''haem''' is a major source of iron (an essential metal), microbes take up exogenous ' haem to retrieve iron.

Noun

(en noun)

Injury; hurt; damage; detriment; misfortune.

* , chapter=13

, title= The Mirror and the Lamp , passage=And Vickers launched forth into a tirade very different from his platform utterances. He spoke with extreme contempt of the dense stupidity exhibited on all occasions by the working classes. He said that if you wanted to do anything for them, you must rule them, not pamper them. Soft heartedness caused more harm than good.}}

That which causes injury, damage, or loss.

* (William Shakespeare)

We, ignorant of ourselves, / Beg often our own harms .