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Eponyms and Words Derived From Proper Nouns 

Eponyms and Words Derived From Proper Nouns

Brenda Gregoline

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Eponyms and Words Derived From Proper Nouns

With eponyms, capitalize the proper name but not the common nouns that follow it.

Down syndrome

Trendelenburg position

Rose-Waaler test

Wada test

Most common words derived from proper nouns are not capitalized. In general, follow the current edition of Merriam-Webster’s Collegiate Dictionary or Dorland’s Illustrated Medical Dictionary (for medical terms).

arabic numerals


brussels sprouts



roman numerals



india ink

Note: JAMA and the Archives Journals do not capitalize arabic and roman when referring to numerals.

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