what does hemi mean
home / medterms medical dictionary a-z list / hemi- definition Medical 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. What Kind of Doctor Do I Need?