masts is a form of:

Mast



noun
1.
A long upright pole that supports a ship's sails, a tall pole from which a flag is flown, any vertical pole, as in a crane. ដងក្ដោង, សសរឬបង្គោលធំៗ
verbpast tense: masted ; past participle: masted ; present participle: masting ;
1.
(TRANSITIVE) ដាក់ដងក្ដោង
ENGLISH MEANING
noun
1.
The fruit of the oak and beech, or other forest trees; nuts; acorns.
2.
A pole, or long, strong, round piece of timber, or spar, set upright in a boat or vessel, to sustain the sails, yards, rigging, etc. A mast may also consist of several pieces of timber united by iron bands, or of a hollow pillar of iron or steel.
3.
The vertical post of a derrick or crane.
4.
A spar or strut to which tie wires or guys are attached for stiffening purposes.
verbpast tense: masted ; past participle: masted ; present participle: masting ;
1.
(TRANSITIVE) To furnish with a mast or masts; to put the masts of in position; as, to mast a ship.