
1) Hadron 2) The antiparticle of a baryon
Found on
https://www.crosswordclues.com/clue/antibaryon

(from the article `antimatter`) ...are now known to have corresponding antiparticles. Thus, there are positive and negative muons, positive and negative pi-mesons, and the K-meson ... Baryons are characterized by a baryon number, B, of 1. Their antiparticles, called antibaryons, have a baryon number of 1. An atom containing, for ... ...
Found on
http://www.britannica.com/eb/a-z/a/82

[
n] - the antiparticle of a baryon
Found on
http://www.webdictionary.co.uk/definition.php?query=antibaryon

The antiparticle of a baryon, having baryon number -1 and charge, strangeness, and other quantum numbers opposite in sign to those of the baryon. See also: Baryon.
Found on
https://www.encyclo.co.uk/local/20687
noun the antiparticle of a baryon; a hadron with a baryon number of -1
Found on
https://www.encyclo.co.uk/local/20974

the antiparticle of a baryon, having baryon number −1 and charge, strangeness, and other quantum numbers opposite in sign to those of the baryon.
Found on
https://www.infoplease.com/dictionary/antibaryon
No exact match found.