Ze'nith. n.s. [Arabick.] The point over head opposite to the nadir.
Fond men! if we believe that men do live
Under the zenith of both frozen poles,
Though none come thence, advertisement to give,
Why bear we not the like faith of our souls? Davies.
These seasons are designed by the motions of the sun, when that approaches nearest our zenith, or vertical point, we call it summer. Brown's Vulgar Errours.