n. A person whose skull is marked with the crossed coronal and sagittal sutures; a skull so marked.n. In mechan., a beam or rod stretching across the top of something; specifically, the bar at the end of a piston-rod of a steam-engine, which slides on ways or guides fixed to the bed or frame of the engine, and connects the piston-rod with the connecting-rod, or with a sliding journal-box moving in the cross-head itself.n. In printing, same as cross-heading.