■ noun
1》 a small bubble on the skin filled with serum and typically caused by friction or burning.
2》 a similar swelling, filled with air or fluid, on a surface.
3》 Medicine, chiefly historical a preparation applied to the skin to form a ~.
4》 Brit. informal, dated an annoying person.
■ verb be or cause to be affected with ~s.
Origin
ME: perh. from OFr. blestre 'swelling, pimple'.