Matter composed of
protons,
neutrons and
electrons. This is the stuff that you and I, and everything else we see on the earth is composed of. As opposed to the supposed
massive particles that interact weakly with the rest of matter, everything from
heavy neutrinos, called
neutralinos, to
photinos or
axions. Taken together these other particles are called
WIMPs or
weakly interacting massive particles.
Source:
http://www.sciforums.com/showthread.php?s=958769a6b30ca834c37bcda0d8644408&threadid=2758