periapsis - WordReference.com Dictionary of English

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  - pergola
  - perhaps
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periapsis

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Concise Oxford English Dictionary © 2008 Oxford University Press:
periapsis /ˌpɛrɪˈapsɪs/

▶noun (pl. periapses /-siːz/) Astronomy the point in the path of an orbiting body at which it is nearest to the body that it orbits.

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