rivulus

[ riv-yuh-luhs ]
/ ˈrɪv yə ləs /

noun, plural riv·u·lus.

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. 2020