IPA: /suːˈpɜːrlʊnər/
KK: /sjuːˈpɜːrlʊnər/
Referring to something that is located above or beyond the Moon when viewed from Earth.
The superlunar spacecraft was designed to explore regions beyond the Moon.
Superlunar is formed from "super-" (meaning above or beyond) and "lunar" (from Latin "lunaris", meaning of the moon). The word refers to something that is beyond or above the moon.
Think of 'super-' meaning above and 'lunar' relating to the moon — this helps you remember that 'superlunar' refers to something beyond the moon.