Wiktionary
n. 1 (context physics English) A proposed form of matter that includes strange quarks in addition to the usual up and down quarks of nuclear matter. 2 (context physics English) A proposed very stable form of matter that protons and neutrons might decay into; matter composed of strangelets.
Wikipedia
Strange matter is a particular form of quark matter, usually thought of as a “liquid” of up, down and strange quarks. It is to be contrasted with nuclear matter, which is a liquid of neutrons and protons (which themselves are built out of up and down quarks), and with non-strange quark matter, which is a quark liquid containing only up and down quarks. At high enough density, strange matter is expected to be color superconducting. Strange matter is hypothesized to occur in the core of neutron stars, or, more speculatively, as isolated droplets that may vary in size from femtometers ( strangelets) to kilometers ( quark stars).
Usage examples of "strange matter".
It seems to me that the only possible weapon we can bring against them is something influencing their own strange matter-state, namely, a form of energy such as a radiation having a heterodyning effect, something that might interfere with the Vitons' natural vibrations.