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:
periastronsOrigin 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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