[ uh-pas-truh n, -tron ]
/ əˈpæs trən, -trɒn /

noun, plural ap·as·tra [uh-pas-truh] /əˈpæs trə/. Astronomy.

the point at which the stars of a binary system are farthest apart (opposed to periastron).

Nearby words

  1. apartment hotel,
  2. apartment house,
  3. apartmental,
  4. apartmentize,
  5. apast,
  6. apatetic,
  7. apathetic,
  8. apathia,
  9. apathism,
  10. apathy

Origin of apastron

< New Latin < Greek ap- ap-2 + ástron star, constellation; on the model of apogee

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science definitions for apastron


[ ə-păstrən ]

The point at which an object, such as a planet or comet, is farthest from the center of mass of the star it is orbiting. Compare periastron.
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