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no·men con·ser·van·dum | \ ˈnō-mən-ˌkän(t)-sər-ˈvan-dəm 
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\ plural nomina conservanda\ ˈnä-mə-nə-ˌkän(t)-sər-ˈvan-də , ˈnō- \
, ˈnō- \Definition of nomen conservandum
: a biological taxonomic name that is preserved by special sanction in exception to the usual rules
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The first known use of nomen conservandum was in 1916
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