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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.
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Adj.1.prodromic - symptomatic of the onset of an attack or a disease
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De La Fuente, "Function and redox state of peritoneal leukocytes as preclinical and prodromic markers in a longitudinal study of triple-transgenic mice for Alzheimer's disease," Journal of Alzheimer's Disease, vol.
For example, low level of serum miRNA-320b is a high-risk factor for carotid atherosclerosis, a prodromic event possibly leading to cerebral ischemia and stroke [201], while miRNA-146a correlates with neuroprotection from cerebral ischemia [202].
This indolent and rather large urachal tumor was mostly revealed by an uncomplicated progressing mass without prodromic urological symptoms.
Applied to BDs, the hypothesis of neuroprogression suggests that different characteristics of the disorder follow a progressive path from prodromic to more severe and refractory presentations (80).