Periastron Definition

pĕrē-ăstrən, -trŏn
periastron
noun
The point at which an object is closest to the center of mass of the star it is orbiting.
American Heritage

Other Word Forms of Periastron

Noun

Singular:
periastron
Plural:
periastrons

Origin of Periastron

  • peri– Greek astron star (probably on the model of perihelion) ster-3 in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

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periastron