earthside in English dictionary earthside Meanings and definitions of "earthside" (science fiction) On the planet Earth (science fiction) When on the planet Earth adjective (science fiction) On the planet Earth. adverb (science fiction) On or to the planet Earth. more Grammar and declension of earthside earthside ( not comparable) earthside (not comparable) more Sample sentences with "earthside" Declension Stem Try again Available translations Cornish Authors