The Collaborative International Dictionary
Paraxial
Paraxial \Par*ax"i*al\, a. [Pref. para- + axial.] (Anat.) On either side of the axis of the skeleton.
Wiktionary
paraxial
a. 1 (context embryology English) Lateral to the neural tube 2 (context physics English) Near an optical axis 3 (context mathematics English) Parallel to one or more axes of the coordinate system