The Collaborative International Dictionary
Hemisect
Hemisect \Hem`i*sect"\, v. t. [imp. & p. p. Hemisected; p. pr. & vb. n. Hemisecting.] [Hemi- + L. secare to cut.] (Anat.) To divide along the mesial plane.
Wiktionary
hemisect
vb. (context anatomy transitive English) To divide along the mesial plane.