hemocyanin
noun
he·mo·cy·a·nin ˌhē-mō-ˈsī-ə-nən 
: a copper-containing respiratory pigment in the circulatory fluid of various arthropods and mollusks
Example Sentences
Recent Examples on the Web 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
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 Word History
Etymology
International Scientific Vocabulary hem- + cyan- + -in entry 1
First Known Use
1885, in the meaning defined above
Medical Definition
hemocyanin
noun
he·mo·cy·a·nin
variants or chiefly British haemocyanin
ˌhē-mō-ˈsī-ə-nən
: a colorless copper-containing respiratory pigment in solution in the blood plasma of various arthropods and mollusks