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  1. Oxford American Dictionary

    respiratory pigment

    • IPA[ˈresp(ə)rəˌtôrē]
    • n.
      a substance (such as hemoglobin or hemocyanin) with a molecule consisting of protein with a pigmented prosthetic group, involved in the physiological transport of oxygen or electrons.

    • noun: respiratory pigment, plural noun: respiratory pigments