D defs.my
Entry 2 senses Webster, 1913

Blain

/(blān)/ · IPA /bleɪn/
01 n. An inflammatory swelling or sore; a bulla, pustule, or blister.
  1. 1.
    An inflammatory swelling or sore; a bulla, pustule, or blister.
    “Blotches and blains must all his flesh emboss.” Milton.
  2. 2.
    A bladder growing on the root of the tongue of a horse, against the windpipe, and stopping the breath.(Far.)