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rivulus

[riv-yuh-luh s] /ˈrɪv yə ləs/
noun, plural rivulus.
1.
any of several killifishes of the genus Rivulus, native to small streams of tropical America, often kept in aquariums.
Origin of rivulus
< New Latin, Latin: rivulet
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Based on the Random House Dictionary, © Random House, Inc. 2016.
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