extragalacticWiktionary 原文英美构词拆解extraextra-前缀galacticgalactic词干extra-Outside of, beyond.词源说明From extra- + galactic.释义形容词adjective1(astronomy) Originating outside of the Milky Way galaxy.2(astronomy) Originating outside of any galaxy.3(science fiction, space flight) Originating outside of the local galaxy.同族词派生词 1