adren-
1 
variant of adreno- before a vowel:
adrenergic.
Related Word
- adrenergic
adren-
combining form
or adreno-
adrenocortical
2. adrenaline
adrenergic
combining form
or adreno-
 ETYMOLOGY  adrenal
1. adrenal glandsadrenocortical
2. adrenaline
adrenergic
adren-
combining form 
or adreno-
Etymology: adrenal (I)  
1. : adrenal glands 
< adrenocortical >
< adrenomedullary >
< adrenotropic >
: adrenal and
< adrenogenital >
2. : adrenaline 
< adrenergic >
or adreno-
1.
< adrenocortical >
< adrenomedullary >
< adrenotropic >
: adrenal and
< adrenogenital >
2.
< adrenergic >