reefs is a form of:

Reef



noun
1.
(a ridge of rock coral or sand, at or just below, the surface of the water) ថ្មប៉ប្រះទឹក
ENGLISH MEANING
noun
1.
A chain or range of rocks lying at or near the surface of the water.
2.
A large vein of auriferous quartz; -- so called in Australia. Hence, any body of rock yielding valuable ore.
verb
1.
(TRANSITIVE) That part of a sail which is taken in or let out by means of the reef points, in order to adapt the size of the sail to the force of the wind.
2.
(TRANSITIVE) To reduce the extent of (as a sail) by roiling or folding a certain portion of it and making it fast to the yard or spar.