Any substance that stimulates growth or activity of the adrenal glands, particularly ACTH.
From 'adreno-' (adrenal gland) + Greek 'trophin' (nourishing, from 'trephein' to nourish).
This is an older, broader term that includes ACTH and other substances that 'feed' or stimulate the adrenal glands—modern medicine uses more specific terms now.
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