reef

³reef

noun

Definition of REEF

1

a : 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

2

: lode, vein

— reefy \ˈrē-fē\ adjective

Origin of REEF

Dutch rif, from Middle Dutch, from Old Norse, literally rib; akin to Old English ribb rib — more at rib

First Known Use: 1584

Other Oceanography Terms

littoral, sound