the answer is "steroid".
Steroids
Steroids are lipids characterized by a carbon skeleton consisting of four fused rings.
stereroids
steroids
steroids.
Yes, Testosterone is a lipid just as many other hormones. More specifically it is a steroid, which are lipid molecules composed of four carbon rings.
Steroid molecules are complex structures that include four connected rings of carbon atoms. Among the more important steroids are cholesterol, which is in all body cells and is used to synthesize other steroids; sex hormones, such as estrogen, progesterone, and testosterone; and several other hormones from the adrenal glands.
Fused heterocylic compounds is a heterocylic compound (eg. Furan) fused with another ring which can be either a carbon ring (benzene) or can be fused with another heterocylic ring(Pyridine,Pyrrole,...etc). Fused heterocyclics can be either 2 fused rings,3 rings or more. From the famous examples on fused heterocylic compounds: -Heroin -Indole -Morphine -Carbazole
Steroids.
steroid
testosterone
steriod