nomen conservandum
/ˌnəʊmɛn ˌkɒnsəˈvandəm/ /ˌnəʊmən ˌkɒnsəˈvandəm/Taxonomy
noun
A Latin name which has been approved for use by a commission of biological nomenclature despite the existence of a technically valid senior synonym, usually on the grounds that it has been in long-standing use.
Origin
Early 20th century. From scientific Latin nomen conservandum from classical Latin nōmen + conservandum, neuter singular of conservandus, gerundive of conservāre.