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Definition of Hemi-

Hemi-: Prefix meaning one half, as in hemiparesis, hemiplegia, and hemithorax. From the Greek hemisus meaning half and equivalent to the Latin semi-. As a general rule, not always followed, hemi- goes with words of Greek origin and semi- with those of Latin origin.

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 6/14/2012

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