Definition(s)
- Something that introduces usually unexpected difficulties, problems, or changes.
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Definition from: Unified Medical Language System
(Metathesaurus Names)
at the National Library of Medicine
- A secondary disease or condition that develops in the course of a primary disease or condition and arises either as a result of it or from independent causes.
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Definition from: Merriam-Webster's Medical Dictionary
by Merriam-Webster Inc.
Related discussion in the Handbook
See also Understanding Medical Terminology.