hulls is a form of:

Hull



noun
1.
(The frame or dody of a ship) ship's hull គ្រោង (នាវា, យន្ដហោះ ។ល។)
Example: To hull peas; to hull strawberries.
2.
(the outer covering of a seed or fruit, the bod of a ship without rigging or deck structures, body of an airship, husk of any fruit, seed, or grain, frame or body of a vessel) peanut hull សំបក (ធញ្ញជាតិ)
verbpast tense: hulled ; past participle: hulled ; present participle: hulling ;
1.
(TRANSITIVE) (to remove shell or husk) យកសំបកចេញ
ENGLISH MEANING
noun
1.
The outer covering of anything, particularly of a nut or of grain; the outer skin of a kernel; the husk.
2.
The frame or body of a vessel, exclusive of her masts, yards, sails, and rigging.
verbpast tense: hulled ; past participle: hulled ; present participle: hulling ;
1.
(TRANSITIVE) To strip off or separate the hull or hulls of; to free from integument; as, to hull corn.
2.
(TRANSITIVE) To pierce the hull of, as a ship, with a cannon ball.
3.
(INTRANSITIVE) To toss or drive on the water, like the hull of a ship without sails.