Any fish belonging to the family Characidae, the same as a characin.
From Characidae plus the suffix '-id' (also '-ide'), which in zoological naming means a member of a family, parallel to the suffix '-in' used in characin.
Characinid and characin mean the same thing—it's like how 'hominid' and 'hominin' are used differently in anthropology. Scientists use both terms, but characin is more common.
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