the pod or capsule of a plant, as of flax or cotton; a pericarp of a globular form.-a scotch measure, formerly in use: for wheat and beans it contained four winchester bushels; for oats, barley, and potatoes, six bushels. a boll of meal is 140 lbs. avoirdupois. also, a measure for salt of two bushels.-to form a boll or seed vessel; to go to seed.