astroid - WordReference.com Dictionary of English

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  - astrantia
  - astray
  - astride
  - astringent
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  - astrobiology
  - astrochemistry
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astroid

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Concise Oxford English Dictionary © 2008 Oxford University Press:
astroid /ˈastrɔɪd/

▶noun Mathematics a hypocycloid with four cusps (like a square with concave sides).

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