Definitions
1.nounA chain or range of rocks, sand, or coral lying at or near the surface of the water.
2.nounA large vein of auriferous quartz; hence, any body of rock yielding valuable ore.
3.nounA portion of a sail rolled and tied down to lessen the area exposed in a high wind.
4.nounA reef knot.
5.verbTo take in part of a sail in order to adapt the size of the sail to the force of the wind.
6.verbTo pull or yank strongly, especially in relation to horse riding.
7.verb(of paddles) To move the floats of a paddle wheel toward its center so that they will not dip so deeply."Reef the paddles."