- cy·clo·pen·ta·no·per·hy·dro·phen·an·threne (si″klo-pen″tə-no-pər-hi″dro-fə-nanґthrēn) the basic skeleton common to the steroids, consisting of a saturated phenanthrene ring (three fused six-member carbocyclic rings) joined to a cyclopentane.
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cyclopentanoperhydrophenanthrene — noun The carbon skeleton found in steroids … Wiktionary
Steroid — A large group of chemical substances related in structure to one another and each containing the same chemical skeleton (a tetracyclic cyclopenta[a]phenanthrene skeleton). Many hormones, body constituents, and drugs are steroids. Examples: drugs… … Medical dictionary