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serum.

Ellipsis of blood serum.

5 characters2 syllables approx.English language

Meaning & usage

noun/ˈsɪəɹəm/UK/ˈsiːɹəm/UK/ˈsɪɹəm/US/ˈsiɹəm/Canada
  1. Ellipsis of blood serum.

    abbreviation · alt-of · countable · ellipsis · uncountable
  2. Blood serum used as a blood product, in the practice of medicine: blood serum from the tissues of immunized animals (human or nonhuman), containing antibodies and used to transfer immunity to another individual (human or nonhuman).

    countable · uncountable
  3. A watery liquid from animal tissue, especially one that moistens the surface of serous membranes or that is exuded by such membranes when they become inflamed, such as in edema or a blister.

    countable · uncountable
  4. The watery portion of certain other animal fluids, such as milk; whey.

    countable · uncountable
  5. A skincare product of varying consistencies with a high concentration of one or more active ingredients, for a targeted purpose, such as preventing acne, repairing sun damage, or moisturizing.

    countable · uncountable
Where this word comes from

Etymology tree Proto-Indo-European *ser- Proto-Indo-European *sér-o-der. Proto-Italic *serom Latin serumder. English serum From Latin serum (“whey”). Cognates include French sérum, Spanish suero, Italian siere, siero, Portuguese soro. Doublet of suero.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.