Pronunciation: (sēr'um), [key]
—pl. se•rums, se•raPronunciation: (sēr'u). [key]
1. the clear, pale-yellow liquid that separates from the clot in the coagulation of blood; blood serum.
2. See immune serum.
3. any watery animal fluid.
4. the thin, clear part of the fluid of plants.
5. milk whey.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.