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brittle star

or brit·tle·star

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noun
  1. any echinoderm of the class Ophiuroidea, having the body composed of a central, rounded disk from which radiate long, slender, fragile arms.
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Origin of brittle star

First recorded in 1835–45
Also called serpent star.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018