minimal reacting dose

min·i·mal re·act·ing dose (MRD, mrd),

the minimal dose of a toxic substance causing a reaction, as manifested in the skin of a series of susceptible test animals; the assay is based on the development of a characteristic, minimal but definite, "standard," focal inflammation (congestion and edema, induration, degenerative changes, and desquamation of epidermal cells).

min·i·mal re·act·ing dose

(MRD) (min'i-măl rē-akt'ting dōs) The minimal dose of a toxic substance causing a reaction, as manifested in the skin of a series of susceptible test animals; the assay is based on the development of a characteristic, minimal but definite, "standard," focal inflammation.