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English definition of “astro-”

astro-

prefix uk   /æs.trəʊ-/ us    /-troʊ-/
relating to space, the planets, stars, or other objects in space, or to a structure in the shape of a star: astrology astronaut astrophysics
(Definition of astro- from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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