reef
noun (1)Definition of reef
(Entry 1 of 3)
1
: a part of a sail taken in or let out in regulating size
2
: reduction in sail area by reefing
reef
verb
reefed;
reefing;
reefs
Definition of reef (Entry 2 of 3)
1
: to reduce the area of (a sail) by rolling or folding a portion
2
: to lower or bring inboard (a spar) wholly or partially
: to reduce a sail by taking in a reef
reef
noun (2)Definition of reef (Entry 3 of 3)
1a
: a chain of rocks or coral or a ridge of sand at or near the surface of water — compare atoll, barrier reef
b
: a hazardous obstruction
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