- An inflammatory swelling or sore; a bulla, pustule, or blister."Blotches and blains must all his flesh emboss." [Milton.]
- [Far] A bladder growing on the root of the tongue of a horse, against the windpipe, and stopping the breath.
Etymology: OE. blein bleyn, AS. blēgen; akin to Dan. blegn, D. blein; perh. fr. the same root as E. bladder. See Bladder