D defs.my
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Entry 1 sense Webster, 1913

Beta

/bāʹtə/ · Be·ta · IPA /ˈbeɪtə/
01 n. The second letter of the Greek alphabet, B, β. See B, and cf. etymology of Alphabet.
  1. 1.
    The second letter of the Greek alphabet, B, β. See B, and cf. etymology of Alphabet.(Astron.) See: B, Alphabet