Medical Definition of secondary
1: not first in order of occurrence or development: asa: dependent or consequent on another disease <secondary diabetes> <Bright's disease is often secondary to scarlet fever>b: occurring or being in the second stage <secondary symptoms of syphilis>c: occurring some time after the original injury <a secondary hemorrhage>
2: characterized by or resulting from the substitution of two atoms or groups in a molecule <a secondary salt>; especially : being, characterized by, or attached to a carbon atom having bonds to two other carbon atoms
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