Definition of rivulus in English:

rivulus

Syllabification: riv·u·lus
Pronunciation: /ˈrivyələs
 
/

noun

A small tropical American fish of shallow fresh and brackish water. Often mistaken for a killifish or topminnow, the rivulus is distinguished by its tubular nostrils.
  • Genus Rivulus, family Rivulidae: several species, many of which are spotted, in particular R. marmoratus

Origin

modern Latin, from Latin, literally 'small stream'.

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Word of the day internecine
Pronunciation: ˌintərˈnesēn
adjective
destructive to both sides in a conflict