antigalaxy

[ an-tee-gal-uhk-see, an-tahy- ]
/ ˈæn tiˌgæl ək si, ˈæn taɪ- /

noun, plural an·ti·gal·ax·ies.

a galaxy consisting of antimatter.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020