coaxial
co.ax.i.al \(')ko--'ak-se--*l\ \-*-le-\ aj 1: having coincident axes 2:
mounted on concentric shafts - co.ax.i.al.ly av
Webster's English Dictionaryco.ax.i.al \(')ko--'ak-se--*l\ \-*-le-\ aj 1: having coincident axes 2:
mounted on concentric shafts - co.ax.i.al.ly av