A congenital condition of abnormal redness in an animal's fur, plumage, or skin.
- ‘Mr. Rowan believed that these eggs were unique and represented the first recorded case of erythrism in crow's eggs.’
- ‘Neither erythrism nor melanism seems to occur in eastern birds, but cases of nearly, or quite, perfect albinism have been reported.’
- ‘Occurrences of erythrism have been reported near this Pennsylvania site in southwestern New York and northeastern Ohio.’
Late 19th century: from Greek eruthros red + -ism.