the GNU version of the Collaborative International Dictionary of English
adj. Between atoms; situated, or acting, between the atoms of bodies.
The Century Dictionary and Cyclopedia
Existing or acting between atoms, especially those of a single molecule.
Word Usage
"Some very interesting work was done on the relaxation of atoms back to the disordered state after pumping, which provided information on the mechanism acting in interatomic collisions and in collisions between atoms and the walls of the container."