Entry from British & World English dictionary
(plural same or rainbowfishes)
Any of a number of small brightly coloured fish of warm waters, in particular:
- ● an Australian freshwater fish (genus Melanotaenia, family Melanotaenidae). ● (Celebes rainbowfish) a freshwater fish native to Sulawesi and popular in aquaria (Telmatherina ladigesi, family Atherinidae).
Definition of rainbowfish in: