One of the mysteries of the English language finally explained.
A Latin name for which there is insufficient information to establish the organism or taxon to which it was intended to be applied.
1930s. From scientific Latin nomen dubium from classical Latin nōmen + dubium, neuter of dubius doubtful.
nomen dubium/ˌnəʊmɛn ˈdjuːbɪəm//ˌnəʊmən ˈdjuːbɪəm/
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