adreno-, adren-, -adrenal-

(Latin: a gland or the glands near the kidneys: ad-, "near" plus ren[es], "kidneys")

The name applies to the adrenal glands because of their proximity to the kidneys.

sympathoadrenal (adjective) (not comparable)
Relating to the sympathetic part of the autonomic nervous system and the medulla of the adrenal gland, as the postganglionic neurons: A decreased sympathoadrenal response can cause unawareness due to the reduced level of blood glucose or hypoglycaemia.