What does blain mean?
A blain is a blister or inflammatory swelling of the skin, typically raised, red, and painful, whether caused by burns, infection, or systemic illness. The word is among the older terms in the English medical vocabulary, appearing in the Bible's account of the plagues of Egypt and persisting through centuries of medical writing before being displaced by more precise terms like 'blister', 'pustule', and 'vesicle'. Today it survives mainly in veterinary contexts, where 'blain' may describe pustular eruptions on livestock, particularly as a symptom of diseases such as anthrax in cattle. Because it is now rare outside specialist and historical texts, encountering a blain in modern prose usually signals either deliberate archaic flavor or technical veterinary usage. Readers should note that its spelling closely resembles 'brain' though the meanings share nothing whatsoever.
nounA blain is an inflammatory swelling or blister on the skin, especially one caused by a burn or by disease such as anthrax in livestock. The word is now largely archaic or technical, surviving chiefly in medical and veterinary contexts.
- An inflammatory swelling or blister on the skin, especially of humans or livestock.
- (Veterinary/medical) A pustular eruption occurring as a symptom of disease, notably anthrax in cattle.
"The veterinarian examined the blains on the cattle's hides with a practiced eye."
"A painful blain rose on his hand where the rope had burned it."
"The herd's blains were diagnosed as a symptom of anthrax."
Regular pluralization; often used in the plural when referring to outbreaks affecting multiple sites or animals.
"The outbreak left blains across the affected livestock."
One of the ten plagues of Egypt was 'blains' — a word so old it predates most of modern English and still turns up on veterinary reports today.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of blain
Blain descends from Old English 'blegen' or 'blǣgen', meaning a blister or sore, making it a genuinely native Germanic word rather than a later borrowing. It is generally traced to the Indo-European root *bhel-, meaning to shine, burn, or flash, which also underlies words like 'flame' and 'blaze'. The term has been in continuous, if declining, use since the earliest periods of English and is best known today from its appearance in biblical translations describing the sixth plague of Egypt.
Related word forms
How blain is actually used
Archaic or highly literary in general use; encountered mainly in historical, biblical (Exodus 9:9), and veterinary texts.
Easily confused with blain
Brain refers to the organ of the nervous system; blain is a skin swelling — they differ only by a single letter but are entirely unrelated in meaning.