statocyst

[stat-uh-sist]
noun Zoology.
(in certain invertebrates) a sense organ consisting of a sac enclosing sensory hairs and particles of sand, lime, etc., that functions in maintaining equilibrium, serving to indicate position in space.

Origin:
1900–05; stato- (see statoblast) + -cyst

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World English Dictionary
statocyst (ˈstætəʊsɪst)
 
n
See statolith an organ of balance in some invertebrates, such as crustaceans, that consists of a sensory vesicle containing small granules

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Example sentences
The animals that were killed immediately after exposure showed signs of damage to their statocyst tissue.
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