quasiparticle
noun
qua·si·par·ti·cle
ˌkwā-ˌzī-ˈpär-ti-kəl
-ˌsī-,
ˌkwä-zē-,
-sē-
: a composite entity (such as a vibration in a solid) that is analogous in its behavior to a single particle
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Merriam-Webster unabridged
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