Hemi- , unlike semi , almost always appears in scientific or technical words, including medical terms such as this one. A hemiplegic , like a paraplegic (who has lost the use of both legs), has usually suffered brain damage, often from a wound or blood clot. Other conditions that affect one side of the body are hemihypertrophy (excessive growth on one side), hemiatrophy (wasting on one side), and hemiparesis (weakness or partial paralysis).
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