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[kwey-zahy-pahr-ti-kuh l, kwey-sahy-, kwah-see, -zee-]
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noun Physics.
  1. an entity, as an exciton or phonon, that interacts with elementary particles, but does not exist as a free particle.
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Origin of quasiparticle

First recorded in 1955–60; quasi- + particle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018