haemocyanin

/HH IY1 M AH0 S AY1 AH0 N AH0 N/
noun
  1. 1

    A blue copper-containing respiratory pigment (a metalloprotein) found in most molluscs, and some arthropods

Source: https://en.wiktionary.org/wiki/haemocyanin, https://en.wiktionary.org/wiki/hemocyanin