subatomic

subatomic
    adj 1: of or relating to constituents of the atom or forces
           within the atom; "subatomic particles"; "harnessing
           subatomic energy"
    2: of smaller than atomic dimensions
    

40 Moby Thesaurus words for "subatomic":
      atomatic, atomic, atomiferous, atomistic, corpuscular, cyclic,
      diatomic, dibasic, embryonic, evanescent, germinal, granular,
      heteroatomic, heterocyclic, hexatomic, homocyclic, impalpable,
      imperceptible, imponderable, inappreciable, indiscernible,
      infinitesimal, intangible, invisible, isobaric, isocyclic,
      isoteric, isotopic, microcosmic, microscopic, molecular, monatomic,
      pentatomic, tenuous, tetratomic, thin, triatomic, tribasic,
      ultramicroscopic, unseeable