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axis ax·is (āk'sĭs)
n. pl. ax·es (āk'sēz')
A real or imaginary straight line about which a body or geometric object rotates or may be conceived to rotate.
A center line to which parts of a structure or body may be referred.
The second cervical vertebra. Also called epistropheus, vertebra dentata.
An artery that divides into many branches at its origin.
Plural axes (āk'sēz')