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rivulus

[riv-yuh-luh s]
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noun, plural riv·u·lus.
  1. any of several killifishes of the genus Rivulus, native to small streams of tropical America, often kept in aquariums.
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Origin of rivulus

< New Latin, Latin: rivulet
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018