Definition of nomenclator

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no·men·cla·tor    (nmn-kltr) KEY 

NOUN:

One who assigns names, as in scientific classification.

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ETYMOLOGY:
Latin nmencltor, a slave who accompanied his master to tell him the names of people he met, variant of nmencultor : nmen, name; see n-men- in Indo-European roots + caltor, servant, crier (from calre, to call; see kel-² in Indo-European roots)