What does "sagittal" mean?

Sagittal: (Anat.) (a) Of or pertaining to the sagittal suture; in the region of the sagittal suture; rabdoidal; as, the sagittal furrow, or groove, on the inner surface of the roof of the skull. (b) In the mesial plane; as, a sagittal section of an animal. Sagittal suture (Anat.), the suture between the two parietal bones in the top of the skull; -- called also rabdoidal suture, and interparietal suture.