hyperfine

adjectives

extremely fine or thin, as in a spectral line split into two or more components
"hyperfine structure"
hyperfine
is similar to
of relatively small extent from one surface to the opposite or in cross section
"thin wire"; "a thin chiffon blouse"; "a thin book"; "a thin layer of paint"
thin
domain category
the science of matter and energy and their interactions
"his favorite subject was physics"
natural philosophy, physics