Baryon
A baryon is a subatomic particle, a hadron (a group of elementary particles that experience strong nuclear force) with a non-integer spin. Baryons accumulated aboard starships as a result of warp travel. They could be removed at facilities that performed baryon sweeps, a procedure lethal to organic material.

Captain Jean-Luc Picard was trapped aboard the  during a baryon sweep at the Remmler Array in 2369. ()

When Quinn transported the  from 2372 to just before the Big Bang, a build-up of baryonic particles was detected outside. ()



Appendices

See also 
 Baryon field
 Baryon radiation

Background information 
Baryons are heavy subatomic particles, including protons and neutrons. As almost all normal matter in the universe contain these particles, a process which eliminates baryons wouldn't leave much behind. We can assume that the baryon sweep refers to a specific type of heavy subatomic particle created by the subspace field of warp drive, rather than the entire family of them. A baryon sweep would thus indeed be dangerous to organic matter, for the reason stated above.

Michael Okuda and Rick Sternbach suggested that a "baryon field unifier" could be used to detect the Bajoran wormhole in a line cut from . Michael Piller used "field density compensator" instead. The line was retained in the ization of . (The Making of Star Trek: Deep Space Nine) External link 
 

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Particles