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Definition of Neo- (prefix)

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Neo- (prefix): Prefix meaning new. From the Greek "neos", new, young, fresh, recent.

Examples of terms starting with "neo-" include neonatal and neonate (the newborn), neoplasia and neoplasm (new growth = tumor), etc.

The opposite of neo- is paleo-. Although paleo- does enter occasionally into medical usage, it is far less commonly encountered than neo- in medicine (and on the pharmacy shelves where there is Neomycin but no Paleomycin).

Reviewed on 12/12/2018

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