, pl. axesDo not confuse this word with access. (1) [TA], A straight line joining two opposing poles of a spheric body, about which the body may revolve. (2) [TA], The central line of the body or any of its parts. (3) [TA], The second cervical vertebra. (4) The vertebral column. SYN: vertebra C2*, epistropheus, odontoid vertebra, second cervical vertebra, toothed vertebra, vertebra dentata. (5) The central nervous system. (6) An artery that divides, immediately on its origin, into a number of branches, e.g., celiac axis.trunk [L. axle, axis]