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  1. Oxford Dictionary

    tryptophan

    • IPA[ˈtrɪptəfan]

    英式

    • n.
      an amino acid which is a constituent of most proteins. It is an essential nutrient in the diet of vertebrates.

    • noun: tryptophan

    • 更多解釋

    tryptophan

    • IPA[ˈtriptəˌfan]

    美式

    • n.
      an amino acid which is a constituent of most proteins. It is an essential nutrient in the diet ...

    Oxford American Dictionary