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
Although the plasma does not directly touch the reactor walls under ideal conditions, intense heat and high-energy particles still impact the inner surfaces.
—
Prabhat Ranjan Mishra, Interesting Engineering, 4 Apr. 2026
Platelet-rich plasma (PRP) scalp injections use growth factors, proteins found in blood platelets that signal tissue generation, to help encourage hair growth in men and women.
—Nicole Hernandez, USA Today, 3 Apr. 2026
Klendathu's legions of arachnid drones and plasma-blasting giant beetles are all under the control of a species of giant arthropods that have somehow evolved into strategic masterminds.
—Richard Edwards, Space.com, 2 Apr. 2026
Carter Taylor sold her plasma to pay bills during her first year of teaching.
—Thomas White, Kansas City Star, 31 Mar. 2026
See All Example Sentences for plasma
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Prabhat Ranjan Mishra, Interesting Engineering, 4 Apr. 2026
Platelet-rich plasma (PRP) scalp injections use growth factors, proteins found in blood platelets that signal tissue generation, to help encourage hair growth in men and women.
—Nicole Hernandez, USA Today, 3 Apr. 2026
Klendathu's legions of arachnid drones and plasma-blasting giant beetles are all under the control of a species of giant arthropods that have somehow evolved into strategic masterminds.
—Richard Edwards, Space.com, 2 Apr. 2026
Carter Taylor sold her plasma to pay bills during her first year of teaching.
—Thomas White, Kansas City Star, 31 Mar. 2026
See All Example Sentences for plasma
Cite this Entry
“Plasma.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/plasma. Accessed 5 Apr. 2026.
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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