steroid ster·oid (stěr'oid', stēr'-)
Any of numerous naturally occurring or synthetic fat-soluble organic compounds having as a basis 17 carbon atoms arranged in four rings and including the sterols and bile acids, adrenocortical and sex hormones, certain natural drugs such as digitalis compounds, and the precursors of certain vitamins. Also called steroid hormone . adj. ste·roid·al (stĭ-roid', stě-)
Relating to or characteristic of steroids or steroid hormones.
When deciding which thyroid hormone to take, most doctors offer women a choice between Armour thyroid, which is ground up or dessicated cow or pig thyroid (also called USP thyroid), or one of the thyroxins (levothyroxine sodium), with the most common brand names of Levoxyl and Synthroid. If you're not going to use Armour, which supplies both T3 and T4 in approximately the ratio made by the human thyroid, I would recommend that you take both thyroxine (T4) and triiodothyroinine (T3), also called liothyronine sodium, with brand names of Cytomel and Triostat.