مَدَارٌ

a verbal noun of دَارَ. (Lth, T.)

And also, as a proper subst., (T,) The axis of the firmament, or celestial orb, [&c.] (T, A.)

[And hence, (assumed tropical:) The point upon which a question, or the like, turns. Pl. مَدَارَاتٌ.]