big adrenocorticotropic hormone (ACTH)

big a·dre·no·cor·ti·co·tro·pic hor·mone (ACTH)

(big ă-drē'nō-kōr-ti-kō-trō'pik hōr'mōn)

A form of ACTH, produced by certain tumors, not immunochemically distinguishable from little ACTH, but not exertingany of the biologic effects characteristic ofACTH.