Answer: mesonic

AnswerCrossword Clue
MESONICOf pions and kaons
mesonicany hadron, or strongly interacting particle, other than a baryon. Mesons are bosons, having spins of 0, 1, 2, ..., and, unlike baryons, do not obey a conservation law
mesonicresembling a meson (a subatomic particle, also MESOTRON)