hemocyanin

• haemocyanin

hemocyanin (countable and uncountable, plural hemocyanins)

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

• keyhole limpet hemocyanin

• “hemocyanin”, in OneLook Dictionary Search.
• hemocyanin, haemocyanin at the Google Books Ngram Viewer.