- antitoxin obtained from the blood serum of immunized animals
- clear watery fluid, esp that exuded by serous membranes
- a less common word for whey
WordReference Random House Learner's Dictionary of American English © 2026
WordReference Random House Unabridged Dictionary of American English © 2026
se•ra
(sēr′ə),USA pronunciation n.
WordReference Random House Learner's Dictionary of American English © 2026- a pl. of serum.
se•rum /ˈsɪrəm/USA pronunciation
n., pl. se•rums, se•ra
WordReference Random House Unabridged Dictionary of American English © 2026- /ˈsɪrə/USA pronunciation .
- Biochemistrythe clear, pale yellow liquid that separates when blood coagulates;
blood serum: [uncountable]a wound oozing serum.[countable]coding different sera. - Biochemistryliquid made from the blood of an animal that contains disease-fighting substances: [uncountable]serum injected into the bloodstream.[countable]a serum for hepatitis.
se•rum
(sēr′əm),USA pronunciation n., pl. se•rums, se•ra
se′rum•al, adj.
-
(sēr′ə).USA pronunciation
- Biochemistrythe clear, pale-yellow liquid that separates from the clot in the coagulation of blood;
blood serum. - ImmunologySee immune serum.
- Biochemistryany watery animal fluid.
- Botanythe thin, clear part of the fluid of plants.
- milk whey.
- Latin: whey
- 1655–65
Collins Concise English Dictionary © HarperCollins Publishers::
serum /ˈsɪərəm/ n ( pl -rums, -ra /-rə/)
'sera' also found in these entries (note: many are not synonyms or translations):