noun, plural splenii /ˈsplininiˌaɪ/ [splee-nee-nee-ahy] Show IPA . Anatomy.
a broad muscle on each side of the back of the neck and the upper part of the thoracic
region, the action of which
draws the head backward and assists in turning it to one side.
Origin: Related forms
1725–35; < Neo-Latin, for Latin splēnium < Greek splēníon plaster, patch