N4cer. basically, yes.
but these terms are as much about marketing as they are about chemistry.
let's be clear. CHEMICALLY speaking, ALL prohormones are steroids.
here is the definition of steroid from a medical dictionary...
"A group name for lipids that contain a hydrogenated cyclopentanoperhydrophenanthrene ring system. Some of the substances included in this group are progesterone, adrenocortical hormones, the gonadal hormones, cardiac aglycones, bile acids, sterols (such as cholesterol), toad poisons, saponins and some of the carcinogenic hydrocarbons. "
CHEMICALLY speaking, prohormones ARE steroids. as are steroids "proper". as are prosteroids. heck, so is cortisone (corticosteroid).
it's a matter of which definition you choose to use. yes, andro is a steroid (chemically speaking). so is CHOLESTEROL. better ban eggs.