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An early symptom indicating the onset of an attack or a disease.
[French, from Latin prodromus, precursor, from Greek prodromos, precursor : pro-, forward; see pro-2 + dromos, running.]
pro·dro′mal (-drō′məl), pro·drom′ic (-drŏm′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.