- any of several stony corals of the genus Acropora, having the skeleton branched like the antlers of a stag.
Also stag's-horn coral.
Origin of staghorn coral
An Americanism dating back to 1880–85
Origin of stag's-horn coral
First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018