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  1. Oxford Dictionary

    Harvard classification

    • IPA[ˈhɑːvəd]

    英式

    • n.
      a system of classification of stars based on their spectral types, the chief classes (O, B, A, F, G, K, M) forming a series from very hot bluish-white stars to cool dull red stars.

    • noun: Harvard classification, plural noun: Harvard classifications