| reef | 1. A chain or range of rocks lying at or near the surface of the water. See Coral reefs, under Coral. 2. <chemical> A large vein of auriferous quartz; so called in Australia. Hence, any body of rock yielding valuable ore. <zoology> Reef builder, any heron of the genus Demigretta; as, the blue reef heron (D.jugularis) of Australia. Origin: Akin to D. Rif, G. Riff, Icel. Rif, Dan. Rev; cf. Icel. Rifa rift, rent, fissure, rifa to rive, bear. Cf. Rift, Rive. Source: Websters Dictionary (01 Mar 1998) |
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| coral calculus | A calculus occurring in the renal pelvis, with branches extending into the infundibula and calices. Synonym: branched calculus, coral calculus, dendritic calculus. (05 Mar 2000) |
| coral reef | a reef consisting of coral consolidated into limestone |
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