hemicraniotomy

hem·i·cra·ni·ot·o·my

(hem'ē-krā'nē-ot'ŏ-mē), Separation and reflection of the greater part or all of one half of the cranium, as a preliminary to an operation upon the brain. Synonym(s): hemicraniectomy [hemi- + G. kranion, skull, + tomē, cut]