is similar to
located in the middle part of a ship or aircraft
is similar to
having two centers
is similar to
having two foci
"bifocal eyeglasses"
is similar to
equally distant from the extremes
is similar to
being or placed in the center
is similar to
having or situated at or near a center
is similar to
having or localized centrally at a focus
"focal point"; "focal infection"
is similar to
relating to or situated in or extending toward the middle
is similar to
being in the exact middle
is similar to
constituting or like a nucleus
"annexation of the suburban fringe by the nuclear metropolis"; "the nuclear core of the congregation"