[ [ Steroid ] Any of a class of organic compounds that contains four rings of carbon atoms (three six-membered and one five). They include certain alkaloids, hormones and vitamins.... More ]
Any of a class of [ Organic ] 1. Relating to or denoting chemical compounds of biological origin. In organic chemistry, compounds which containing carbon chains, as in organic_chemistry Some carbon-containing compounds such as carbides, carbonates, simple oxides (carbon monoxide and carbon dioxide), and cyanides are considered inorganic. 2. Produced or involving production without the use of artificial chemicals, as in organic_nutrients, organic_farming and organic_foods.... More compounds that contains four rings of carbon atoms (three six-membered and one five). They include certain alkaloids, [ hormone ] A substance that acts as a signal between organs and tissue to regulate physiology and behaviour. Hormones are secreted directly into the circulatory system by specialised cells in glands and other organs. They regulate metabolic activities, growth and tissue repair, sexual function, sleep and emotions, to name a few. Hormones are either Amino acid–based (amines and peptide... More and vitamins.