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  1. Oxford American Dictionary

    trigonal

    • IPA[ˈtriɡənl]

    美式

    • adj.
      triangular；triangular in cross section
    • 釋義

    形容詞

    • 1. triangular square or trigonal double-sided inserts
    • ▪ triangular in cross section large trigonal shells
    • ▪ of or denoting a crystal system or three-dimensional geometric arrangement having three equal axes separated by equal angles that are not right angles.