equatorial

nouns

a telescope whose mounting has only two axes of motion, one parallel to the Earth's axis and the other one at right angles to it
equatorial
is a type of (narrower)
a magnifier of images of distant objects
scope, telescope

adjectives

of or relating to or at an equator
"equatorial diameter"
equatorial
is derived from
equator
pertains to
equator
of or relating to conditions at the geographical equator
"equatorial heat"
equatorial
pertains to
equator
of or existing at or near the geographic equator
"equatorial Africa"
equatorial
is derived from
equator
antonym
polar
is similar to
distributed throughout the tropics
pantropic, pantropical
is similar to
relating to or situated in or characteristic of the tropics (the region on either side of the equator)
"tropical islands"; "tropical fruit"
tropic, tropical