The optical axis of an eye (extending from the viewed object through the centre of the pupil to the yellow spot of the retina)

A South Asian deer, the chital, Axis axis

Synonym of non-aggression principle

(biology, dated) An axon.

plural of axis cylinder

(transport, rail transport) the total weight, including load carried, transferred by one axle and its wheels to a road or railway surface. This is especially important in relation to what weight road and railway structures can carry, bridges in particular.

a support which can be placed under an axle, subframe or other suitable point when a vehicle is undergoing maintenance.

plural of axle load

plural of axle stand

The condition of being axenic