ferric oxide

nouns

a red oxide of iron
ferric oxide
is made of
the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water
rust, rusting
is made of
a granular brown substance composed of ferric oxide; left from the breakdown of hemoglobin; can be a sign of disturbed iron metabolism
haemosiderin, hemosiderin
is a type of (narrower)
any compound of oxygen with another element or a radical
oxide