Definition of haemocyanin in English:

Share this entry


Pronunciation: /ˌhiːmə(ʊ)ˈsʌɪənɪn/
(US hemocyanin)


[mass noun] Biochemistry
A protein containing copper, responsible for transporting oxygen in the blood plasma of arthropods and molluscs.
Example sentences
  • It is intriguing that crustaceans seem to express either hemoglobin or hemocyanin but not both proteins.
  • One grasshopper embryo has a protein that closely resembles hemocyanin in sequence, but no oxygen binding studies to confirm its function have yet been done.
  • The ontogeny of crustacean hemocyanin, the copper-based oxygen transport protein, has been studied in relatively few species, including Nephrops norvegicus and Homarus americanus.


Mid 19th century: from haemo- 'of blood' + cyan + -in1.

For editors and proofreaders

Line breaks: haemo|cya¦nin

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.