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  1. Oxford Dictionary

    tetracyclic

    • IPA[tɛtrəˈsʌɪklɪk]

    英式

    • adj.
      (of a compound) having a molecular structure of four fused hydrocarbon rings.
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    tetracyclic

    • IPA[ˌtetrəˈsīklik]

    美式

    • adj.
      (of an organic compound) having four fused rings of atoms in its molecule.

    Oxford American Dictionary