a. [ L. sagitta an arrow: cf. F. sagittal. ] 1. Of or pertaining to an arrow; resembling an arrow; furnished with an arrowlike appendage. [ 1913 Webster ]

2. (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; mesial; as, a sagittal section of an animal. [ 1913 Webster ]

Sagittal suture (Anat.), the suture between the two parietal bones in the top of the skull; -- called also rabdoidal suture, and interparietal suture. [ 1913 Webster ]