The difference between Trinary star and Trinary star system
When used as nouns, trinary star means a stellar system that has three stars orbiting around each other, whereas trinary star system means a trinary star.
check bellow for the other definitions of Trinary star and Trinary star system
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Trinary star as a noun (star):
A stellar system that has three stars orbiting around each other; triple star.
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Trinary star system as a noun (star):
a trinary star