IPA: /ˌmɛtəˈɡæləktɪk/
KK: /mɛtəˈɡæləktɪk/
Relating to a large collection of galaxies or the universe beyond our own galaxy.
The scientists studied metagalactic phenomena to understand the structure of the universe.
Metagalactic → It is formed from "meta-" (meaning beyond or transcending) and "galactic" (from Greek "galaxias", meaning milky or related to the Milky Way). The word "metagalactic" refers to something that is beyond or transcending the galaxy.
Think of 'beyond' ('meta-') the 'galaxy' ('galactic') to remember that 'metagalactic' refers to something that exists outside or transcends our galaxy.