Added 9 October 2026 steroid /ˈstɛɹɔɪd/ noun Categories: NatureUncommon Words noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about steroid at Wordnik → Where our words come from → Any of several fat-soluble organic compounds having as a basis 17 carbon atoms in four rings; many have important physiological effects. Any hormone affecting the development and growth of sex organs. Related Words: hormoneanabolicdopingringinhaledstimulantsglucocorticoidprogestinestrogentestosterone Back to today's word