1
: a green faintly translucent quartz
2
[New Latin, from Late Latin]
a
: the fluid part of blood, lymph, or milk as distinguished from suspended material
especially
: blood plasma
b
: the juice that can be expressed from muscle
3
4
: a collection of charged particles (as in the atmospheres of stars or in a metal) containing about equal numbers of positive ions and electrons and exhibiting some properties of a gas but differing from a gas in being a good conductor of electricity and in being affected by a magnetic field
5
: a display (such as a television screen) consisting of discrete cells of plasma sandwiched between two layers of glass and electrodes such that each cell emits light when it receives an electric current
Examples of plasma in a Sentence
the plasma that makes up a star
Our new TV is a 50-inch plasma.
Recent Examples on the Web
The coroner ruled Carol’s cause of death as hypovolemia, which is when the plasma is too low from excessive bleeding; multiple stab and incised wounds from a sharp instrument; and a blunt force injury that fractured the skull, according to the coroner’s report.
—
Stephanie Warsmith, USA Today, 8 June 2025
Verdin is also co-founder of a plasma exchange company.
—Jamie Ducharme, Health, 6 June 2025
In the new solar views, the plasma is artificially colorized to appear pink, with darker-looking areas translating to brighter regions.
—Elizabeth Gamillo, Smithsonian Magazine, 4 June 2025
The Dodgers had attempted non-invasive remedies, including a platelet-rich plasma injection, but ultimately settled for the surgery that had been forecast for weeks.
—Fabian Ardaya, New York Times, 31 May 2025
See All Example Sentences for plasma
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Stephanie Warsmith, USA Today, 8 June 2025
Verdin is also co-founder of a plasma exchange company.
—Jamie Ducharme, Health, 6 June 2025
In the new solar views, the plasma is artificially colorized to appear pink, with darker-looking areas translating to brighter regions.
—Elizabeth Gamillo, Smithsonian Magazine, 4 June 2025
The Dodgers had attempted non-invasive remedies, including a platelet-rich plasma injection, but ultimately settled for the surgery that had been forecast for weeks.
—Fabian Ardaya, New York Times, 31 May 2025
See All Example Sentences for plasma
Cite this Entry
“Plasma.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/plasma. Accessed 17 Jun. 2025.
Copy CitationKids Definition
plasma
noun
plas·ma
ˈplaz-mə 
1
: the watery part of blood, lymph, or milk
2
: a collection of charged particles that shows some characteristics of a gas but that differs from a gas in being a good conductor of electricity and in being affected by a magnetic field
Medical Definition
plasma
noun
plas·ma
ˈplaz-mə
1
a
: the fluid part especially of blood, lymph, or milk that is distinguished from suspended material see blood plasma
b
: the juice that can be expressed from muscle
2
3
: a mixture of starch and gel used as an ointment base
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