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  1. effectual

    • IPA[ɪˈfɛktʃʊəl]

    英式

    • adj.
      (of something inanimate or abstract) successful in producing a desired or intended result; effective;(of a legal document) valid or binding.
    • 釋義

    形容詞

    • 更多解釋
    • IPA[əˈfek(t)SH(o͞o)əl]

    美式

    • adj.
      (of something inanimate or abstract) successful in producing a desired or intended result; ... tobacco smoke is the most effectual protection against the mosquito

    Oxford American Dictionary