antigen
noun/ˈæntiˌdʒɛn/
Frequency rank: #10,450 of 20,003 in the WORDED list (wordfreq data)
Meaning
a substance that triggers an immune response in the body, especially the production of antibodies.

Example sentence
The vaccine works by introducing a specific antigen that trains the immune system to recognize the virus.
Synonyms & related words
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