serum [serum sera serums] BrE [ˈsɪərəm]
NAmE [ˈsɪrəm]
noun (pl. sera BrE [ˈsɪərə]
; NAmE [ˈsɪrrə]
or ser·ums)
1. uncountable (biology) the thin liquid that remains from blood when the rest has clotted
2. uncountable, countable (medical) serum taken from the blood of an animal and given to people to protect them from disease, poison, etc
snakebite serum
3. uncountable any liquid like water in body tissue
Word Origin:
late 17th cent.: from Latin, literally whey.

WordNet Dictionary:
an amber, watery fluid, rich in proteins, that separates out when blood coagulates
Syn: blood serum
Syn: retainer
- The tree stump serves as a table
- The female students served as a control group
- This table would serve very well
- His freedom served him well
- The table functions as a desk
Syn: function
2. do duty or hold offices; serve in a specific function
- He served as head of the department for three years
- She served in Congress for two terms
3. contribute or conduce to
- The scandal served to increase his popularity
4. be used by; as of a utility
- The sewage plant served the neighboring communities
- The garage served to shelter his horses
Syn: service
5. help to some food; help with food or drink
- I served him three times, and after that he helped himself
Syn: help
- We serve meals for the homeless
- She dished out the soup at 8 P.M.
- The entertainers served up a lively show
Syn: serve up, dish out, dish up, dish
- The chefs serve the vegetables
7. devote (part of) one's life or efforts to, as of countries, institutions, or ideas
- She served the art of music
- He served the church
- serve the country
8. promote, benefit, or be useful or beneficial to
- Art serves commerce
- Their interests are served
- The lake serves recreation
- The President's wisdom has served the country well
Syn: serve well
- May I serve you?
- She attends the old lady in the wheelchair
- Can you wait on our table, please?
- Is a salesperson assisting you?
- The minister served the King for many years
Syn: attend to, wait on, attend, assist
- He was processed by the sheriff
Syn: process, swear out
11. spend time in prison or in a labor camp
- He did six years for embezzlement
Syn: do
12. be sufficient; be adequate, either in quality or quantity
- A few words would answer
- This car suits my purpose well
- Will $100 do?
- A 'B' grade doesn't suffice to get me into medical school
- Nothing else will serve
Syn: suffice, do, answer
(for: suffice)
13. do military service
- She served in Vietnam
- My sons never served, because they are short-sighted
14. mate with
- male animals serve the females for breeding purposes
Syn: service
15. put the ball into play
- It was Agassi's turn to serve
- We serve meals for the homeless
- She dished out the soup at 8 P.M.
- The entertainers served up a lively show
Syn: serve, dish out, dish up, dish
- The chefs serve up the vegetables

Webster's 1913 Dictionary:
n.1.(Physiol.) The watery portion of certain animal fluids, as blood, milk, etc.
Blood serum
the pale yellowish fluid which exudes from the clot formed in the coagulation of the blood; the liquid portion of the blood, after removal of the blood corpuscles and the fibrin.
Muscle serum
the thin watery fluid which separates from the muscles after coagulation of the muscle plasma; the watery portion of the plasma. See Muscle plasma, under Plasma.
Serum albumin
(Physiol. Chem.) an albuminous body, closely related to egg albumin, present in nearly all serous fluids; esp., the albumin of blood serum.
Serum globulin
(Physiol. Chem.) paraglobulin.
Serum of milk
(Physiol. Chem.) the whey, or fluid portion of milk, remaining after removal of the casein and fat.

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