hem·​ag·​glu·​ti·​nin ˌhē-mə-ˈglü-tə-nən How to pronounce hemagglutinin (audio)
: an agglutinin (such as an antibody or viral capsid protein) that causes hemagglutination

Example Sentences

Recent Examples on the Web To gain access to a host’s cells, influenza uses its own viral glycoprotein, hemagglutinin (H). Quanta Magazine, 25 Feb. 2020 Viral code The Hs and Ns refer to hemagglutinin (Ha or H) and neuraminidase (Na or N), respectively, which are both viral molecules that hang on the outside of viral particles. Beth Mole, Ars Technica, 10 Dec. 2019 Krammer used a novel assay to measure the hemagglutinin stalk antibodies. Debbie Ponchner, Scientific American, 3 June 2019 Current flu vaccines induce the production of antibodies that recognize the hemagglutinin head and inhibit its ability to mediate viral entry into a cell. Debbie Ponchner, Scientific American, 3 June 2019 Scientists have been sequencing hemagglutinin genes from flu seasons for more than 40 years. Quanta Magazine, 17 July 2014 Those harmful mutations make hemagglutinin less stable and thus less able to open up cells for invasion. Quanta Magazine, 17 July 2014 There are 18 different hemagglutinin subtypes and 11 different N subtypes, leading to nomenclature like H3N1. Diana Gitig, Ars Technica, 5 Nov. 2018 Researchers had to manually assess the sequences for differences, focusing on regions known to be important for transmission such as hemagglutinin, the protein that binds the virus to the host cell. Quanta Magazine, 29 Aug. 2013 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'hemagglutinin.' 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

First Known Use

circa 1903, in the meaning defined above

Time Traveler
The first known use of hemagglutinin was circa 1903

Dictionary Entries Near hemagglutinin

Cite this Entry

“Hemagglutinin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hemagglutinin. Accessed 31 Mar. 2023.

Medical Definition


hem·​ag·​glu·​ti·​nin ˌhē-mə-ˈglüt-ᵊn-ən How to pronounce hemagglutinin (audio)
variants also hemoagglutinin or chiefly British haemagglutinin also haemoagglutinin
: an agglutinin (as an antibody or viral capsid protein) that causes hemagglutination
abbreviation HA
compare leukoagglutinin

More from Merriam-Webster on hemagglutinin

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Challenging Standardized Test Words, Vol. 2

  • a pencil broken in half on top of a test answer sheet
  • The business’s new computer system proved not to be a panacea.
Spell It

Hear a word and type it out. How many can you get right?

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?