respiratory pigment

/R EH1 S P ER0 AH0 T AO0 R IY0 P IH0 G M AH0 N T/
noun
  1. 1

    Any of several coloured metal-containing protein pigments which combine reversibly with oxygen and which are found in the tissues of vertebrates and invertebrates and whose role is to transport oxygen

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Source: https://en.wiktionary.org/wiki/respiratory%20pigment