antibody
noun
an·ti·body
ˈan-ti-ˌbä-dē 
: any of a large number of proteins of high molecular weight that are produced normally by specialized B cells after stimulation by an antigen and act specifically against the antigen in an immune response, that are produced abnormally by some cancer cells, and that typically consist of four subunits including two heavy chains and two light chains
called also immunoglobulin
Examples of antibody in a Sentence
Recent Examples on the Web
People in Risk Category 1, the highest risk, should have their blood checked for antibody titers six months after the second dose of the vaccine to make sure they are optimally protected.
—
Katia Hetter, CNN Money, 18 Sep. 2025
The story is equally compelling in lymphomas and leukemia, where the very first bispecific antibody—Blinatumomab, approved back in 2014—set the stage.
—William A. Haseltine, Forbes.com, 18 Sep. 2025
To be diagnosed, a person must test positive to two tests that detect antibodies to different antigens, or a foreign substance in the body like toxins, bacteria, chemicals or viruses, of the parasite, the CDC said.
—Jennifer Rodriguez, Miami Herald, 17 Sep. 2025
Cancerous plasma cells produce abnormal antibodies called M-proteins that can’t fight infections.
—Lindsay Curtis, Health, 14 Sep. 2025
See All Example Sentences for antibody
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Katia Hetter, CNN Money, 18 Sep. 2025
The story is equally compelling in lymphomas and leukemia, where the very first bispecific antibody—Blinatumomab, approved back in 2014—set the stage.
—William A. Haseltine, Forbes.com, 18 Sep. 2025
To be diagnosed, a person must test positive to two tests that detect antibodies to different antigens, or a foreign substance in the body like toxins, bacteria, chemicals or viruses, of the parasite, the CDC said.
—Jennifer Rodriguez, Miami Herald, 17 Sep. 2025
Cancerous plasma cells produce abnormal antibodies called M-proteins that can’t fight infections.
—Lindsay Curtis, Health, 14 Sep. 2025
See All Example Sentences for antibody
Cite this Entry
“Antibody.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/antibody. Accessed 23 Sep. 2025.
Copy CitationKids Definition
antibody
noun
an·ti·body
ˈant-i-ˌbäd-ē
: a substance produced by special cells of the body that combines with an antigen and counteracts its effects or those of the microscopic plant or animal on which the antigen may occur
Medical Definition
antibody
noun
an·ti·body
ˈant-i-ˌbäd-ē
plural antibodies
: any of a large number of proteins of high molecular weight that are produced normally by specialized B cells after stimulation by an antigen and act specifically against the antigen in an immune response, that are produced abnormally by some cancer cells, and that typically consist of four subunits including two heavy chains and two light chains
called also immunoglobulin
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