aIsodiabatic(Physics) Pertaining to the reception or the giving out of equal quantities of heat by a substance.
Century Dictionary and Cyclopedia
isodiabaticPertaining to the transmission to or from a body of equal quantities of heat. Thus, isodiabatic parts of isothermal curves are parts which represent changes of pressure and density of the same body during the transmission of equal quantities of heat, the temperature remaining constant.
nisodiabaticA curve which represents the isothermal changes of pressure and volume of a substance while the same quantity of heat is being transferred to it or from it.