hectare
1
hemagglutinin
Different circulating influenza A viruses are identified by referring to two signature proteins on their surfaces. One is hemagglutinin (HA), which has at least 15 known variants, or subtypes.—
Jeffery K. Taubenberger et al.
Jeffery K. Taubenberger et al.2
hour angle
Examples of ha in a Sentence
Interjection
ha! I was right all along!
Recent Examples on the Web
Tereza Shkurtaj, PEOPLE, 7 June 2026
An a-ha moment arrives quietly, but meaningfully, as the moon harmonizes with Chiron.
—Usa Today, USA Today, 6 June 2026
The Original took back control of the match wit ha suplex.
—Alfred Konuwa, Forbes.com, 31 May 2026
The Enthoven family refer to themselves as custodians of Spier, an indication of their long-view commitment to their 620-ha parcel of land.
—Condé Nast, Condé Nast Traveler, 27 May 2026
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Interjection
Among the many celebrities featured in the collection, Morten Harket, the frontman of the synth-pop band A-ha, was clearly a favorite.
—Tereza Shkurtaj, PEOPLE, 7 June 2026
An a-ha moment arrives quietly, but meaningfully, as the moon harmonizes with Chiron.
—Usa Today, USA Today, 6 June 2026
The Original took back control of the match wit ha suplex.
—Alfred Konuwa, Forbes.com, 31 May 2026
The Enthoven family refer to themselves as custodians of Spier, an indication of their long-view commitment to their 620-ha parcel of land.
—Condé Nast, Condé Nast Traveler, 27 May 2026
See All Example Sentences for ha
Cite this Entry
“Ha.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ha. Accessed 14 Jun. 2026.
Copy CitationMedical Definition
HA
abbreviation
hemagglutinin
Seasonal strains … evade our immune systems after vaccination or previous infection by constantly changing the structure of their hemagglutinin (HA) surface protein.—Charles J. Russell, The New England Journal of Medicine
Charles J. Russell, The New England Journal of MedicineLove words? Need even more definitions?
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