barometer crab

noun

Definition of barometer crab

: a crab (Carpillius maculatus) of the Great Barrier reef that is lilac colored with 11 symmetrically placed blood-red spots that are said to change in appearance with the state of the weather

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“Barometer crab.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/barometer%20crab. Accessed 31 Oct. 2020.

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