(n.) The mesial plane dividing the body of an animal into similar right and left halves. The line in which it meets the dorsal surface has been called the dorsimeson, and the corresponding ventral edge the ventrimeson.

Kern NMR alpha particle antibaryon antilepton antimeson atom atomic nucleus atomic particle aurora particle baryon beta particle electron elementary particle heavy particle ion lepton mesotron molecule monad neutron nuclear force nuclear magnetic resonance nuclear particle nuclear resonance nucleon nucleosynthesis nucleus photon proton quark radioactive particle radion solar particle strangeness strong interaction triton valence electron