strange matter

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Quark matter that contains up, down, and strange quarks, as distinguished from nonstrange quark matter.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun physics A proposed form of matter that includes strange quarks in addition to the usual up and down quarks of nuclear matter.
• noun physics A proposed very stable form of matter that protons and neutrons might decay into; matter composed if strangelets.