Define or disambiguate "nonphysics"

[gold2718]

In standard names, such as tendency_of_water_vapor_mixing_ratio_wrt_moist_air_due_to_nonphysics, the term, nonphysics has no definition. I feel like we should either have a definition (e.g., nonphysics == dycore) or break up the term into a set that does have specific definitions.