Dictionary![]() ![]() crown'-of-thorns' star"fishPronunciation: (kroun'uv-thôrnz'), [key] a starfish, Acanthaster planci, that feeds on living coral polyps, causing erosion and destruction of coral reefs. Also called crown of thorns. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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