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
Cite this Entry
“Plasma.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/plasma. Accessed 5 Aug. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
