| reef | a rocky region in the southern Transvaal in northeastern South Africa |
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| reef | a submerged ridge of rock or coral near the surface of the water |
| reef | reduce (a sail) by taking in a reef |
| reef | roll up (a portion of a sail) in order to reduce its area |
| reef | lower and bring partially inboard, as of a mast on a sailboat |
| reef | a square knot used in a reef line |
| reef | on reefs from Bermuda and Florida to northern South America |
| reef | smooth dogfish of Pacific and Indian oceans and Red Sea having white-tipped dorsal and caudal fins |
| reef | marijuana leaves rolled into a cigarette for smoking |
| reef | full of submerged reefs or sandbanks or shoals |