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/pɛɹɪˈæstɹən/ · noun
(astronomy) That point of the orbit of a celestial body which is closest to the star around which the body is orbiting..
Use periastron when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Periastron means (astronomy) That point of the orbit of a celestial body which is closest to the star around which the body is orbiting..
The closest synonym depends on the sentence and intended sense.
Possible antonyms include apastron.
Use periastron where its definition matches the intended context.
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