ab.

Preposition

about

1. In a circle around; all round; on every side of; on the outside of; around.
   • The snake was coiled about his ankle.
2. Over or upon different parts of; through or over in various directions; here and there in; to and fro in; throughout.
   • Rubbish was strewn about the place.
3. See about to.
4. (dialectal, obsolete) On the point or verge of.
   • [It] was held, that the latter requirement was fulfilled by an affidavit declaring that "the defendant was about leaving the State permanently."1866, Charles Daniel Drake, A treatise on the law of suits by attachment in the United States, page 80
5. Concerning; with regard to; on account of; on the subject of.
   • He talked a lot about his childhood.

   Synonyms:

   apropos, as for

6. Concerned or occupied with; engaged in; intent on.
   • just going about their business

See all 27 meanings of about

Noun

antibody (plural antibodies)

1. A protein produced by B-lymphocytes that binds to a specific antigen.
   • It’s estimated only 0.1% of antibodies circulating in the bloodstream enter the brain – this also includes the therapeutic antibodies currently used in clinical trials. An approach my team is taking is to use ultrasound to temporarily open the blood-brain barrier, which increases the uptake of...2018 January 18, Jürgen Götz, “Why it’s so hard to treat dementia”, in CNN

   Synonyms:

   immunoglobulin, immune globulin

   Antonyms:

   antigen, Ag