Definition of pentaquark in English:

pentaquark

Syllabification: pen·ta·quark
Pronunciation: /ˈpentəˌkwärk/

Entry from US English dictionary

noun

Physics
  • A baryon consisting of four quarks and an antiquark.

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Word of the day coloratura
Pronunciation: ˌkələrəˈto͝orə
noun
elaborate ornamentation of a vocal melody