Erthryron may refer to:
* the sum of all
red blood cells
Red blood cells (RBCs), also referred to as red cells, red blood corpuscles (in humans or other animals not having nucleus in red blood cells), haematids, erythroid cells or erythrocytes (from Greek language, Greek ''erythros'' for "red" and ''k ...
in the body
* the ancient town of
Erythrum
Erythrum was a city and bishopric in Roman Africa, which remains a Catholic titular see.
The city, identified with modern Uaili-Et-Trun, was important enough in the Roman province of (Creta and) Cyrenaica and later the split-off province Libya Su ...
in modern-day Libya
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