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
According to the research team, the XICS is equipped with an advanced calibration system designed to provide accurate measurements through changes in plasma density and temperature.
—
Aman Tripathi, Interesting Engineering, 16 Oct. 2025
Particularly in the case of the latter two galaxies, the radio jets seem to be interacting with the intra-cluster medium, which is a thick fog of hot plasma that fills galaxy clusters, and this interaction is shaping both the jets and the radio rings.
—Keith Cooper, Space.com, 14 Oct. 2025
The tokamak, a Soviet-era Russian invention, uses a powerful magnetic field to hold the hot plasma where fusion occurs.
—Jeff Young, MSNBC Newsweek, 14 Oct. 2025
The plasma clouds were likely first created by jets of material released by the galaxy’s supermassive black hole, Hota explained.
—Ashley Strickland, CNN Money, 14 Oct. 2025
See All Example Sentences for plasma
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Aman Tripathi, Interesting Engineering, 16 Oct. 2025
Particularly in the case of the latter two galaxies, the radio jets seem to be interacting with the intra-cluster medium, which is a thick fog of hot plasma that fills galaxy clusters, and this interaction is shaping both the jets and the radio rings.
—Keith Cooper, Space.com, 14 Oct. 2025
The tokamak, a Soviet-era Russian invention, uses a powerful magnetic field to hold the hot plasma where fusion occurs.
—Jeff Young, MSNBC Newsweek, 14 Oct. 2025
The plasma clouds were likely first created by jets of material released by the galaxy’s supermassive black hole, Hota explained.
—Ashley Strickland, CNN Money, 14 Oct. 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 18 Oct. 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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