equatorial

equa·to·ri·al

adj
\ˌē-kwə-ˈtōr-ē-əl, ˌek-wə-, -ˈtȯr-\

Definition of EQUATORIAL

1

: of, located at, or relating to an equator <equatorial diameter>

2

: extending in a direction essentially in the plane of a cyclic structure (as of cyclohexane) <equatorial hydrogen atoms>—compare axial 2b