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quasiparticle

[kwey-zahy-pahr-ti-kuh l, kwey-sahy-, kwah-see, -zee-] /ˌkweɪ zaɪˈpɑr tɪ kəl, ˌkweɪ saɪ-, ˌkwɑ si, -zi-/
noun, Physics.
1.
an entity, as an exciton or phonon, that interacts with elementary particles, but does not exist as a free particle.
Origin of quasiparticle
1955-1960
1955-60; quasi- + particle
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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