What is the definition of sagittal?

Of or pertaining to an arrow; resembling an arrow; furnished with an arrowlike appendage., 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., In the mesial plane; mesial; as, a sagittal section of an animal.