astro- Meaning in the Cambridge English Dictionary
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Meaning of “astro-” in the English Dictionary

"astro-" in British English

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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 Learner’s Dictionary & Thesaurus © Cambridge University Press)
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