he·​mo·​cy·​a·​nin ˌhē-mō-ˈsī-ə-nən How to pronounce hemocyanin (audio)
: a copper-containing respiratory pigment in the circulatory fluid of various arthropods and mollusks

Examples of hemocyanin in a Sentence

Recent Examples on the Web The researchers also weighed the crabs without their shells and measured their levels of hemocyanin, a molecule that carries oxygen in the blood. Elizabeth Preston, Discover Magazine, 3 Mar. 2015 Zorrilla’s experimental antiobesity vaccine consists of ghrelin molecules chemically linked to hemocyanin, a protein extracted from the keyhole limpet marine snail. Jessica Snyder Sachs, Discover Magazine, 15 Feb. 2012 Crabs with more hemocyanin have better aerobic endurance, which might help them when fighting a rival. Elizabeth Preston, Discover Magazine, 3 Mar. 2015 The protein, hemocyanin, is a key ingredient in the skin cream that Patrick Breeding, 27, and Amber Boutiette, 29, distribute from a bare-bones, former steel factory on the outskirts of Portland. Brian MacQuarrie, BostonGlobe.com, 30 Sep. 2022 Their equivalent to blood is hemolymph, a mostly clear fluid that contains small amounts of hemocyanin. Quanta Magazine, 22 Apr. 2019 Consider hemocyanin, which is so widely used among invertebrates. Quanta Magazine, 22 Apr. 2019 The scientists discovered that gribbles use hemocyanins to attack the strong bonds of lignin. David Grossman, Popular Mechanics, 5 Dec. 2018 Octopuses, lobsters and horseshoe crabs use hemocyanin, which means blue blood. Laura Yan, Popular Mechanics, 20 May 2018

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'hemocyanin.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


International Scientific Vocabulary hem- + cyan- + -in entry 1

First Known Use

1885, in the meaning defined above

Time Traveler
The first known use of hemocyanin was in 1885

Dictionary Entries Near hemocyanin

Cite this Entry

“Hemocyanin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hemocyanin. Accessed 13 Jun. 2024.

Medical Definition


variants or chiefly British haemocyanin
: a colorless copper-containing respiratory pigment in solution in the blood plasma of various arthropods and mollusks

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