Particle Physics a type of quark with a mass of c. 0.1 to 0.3 GeV/c, a negative charge that is the charge of an electron, zero charm, and −1 strangeness
See strange quark in American Heritage Dictionary 4
strange quark
noun Abbr. s
A quark with a charge of - 1/3 , a mass about 400 times that of the electron, and a strangeness of -1. See Table at subatomic particle.