[quark] n [coined by Murray Gell-Mann] (1964): any of several elementary particles that are postulated to come in pairs (as in the up and down varieties) of similar mass with one member having a charge of positive 2/3 and the other a charge of -1/3 and are held to make up hadrons
QUARK
Meaning of QUARK in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012