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subaxial sub·ax·i·al (sŭb-āk'sē-əl)
Located below the axis of the body or a body part.
axial ax·i·al (āk'sē-əl)
Relating to or characterized by an axis; axile.
Relating to or situated in the head and trunk region of the body.
Relating to or parallel with the long axis of a tooth.