A secosteroid (//) is a type of steroid with a "broken" ring. The word secosteroid derives from the Latin verb secare meaning "to cut",: 241 and 'steroid'. Secosteroids are alternatively described as a subclass of steroids or derived from steroids.
Types or subclasses of secosteroids are defined by the carbon atoms of the parent steroid skeleton where the ring cleavage has taken place. For example, 9,10-secosteroids derived from cleavage of the bond between carbon atoms C9 and C10 of the steroid B-ring (similarly 5,6-secosteroids, 13,14-steroids, etc.).
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Steroids are compounds possessing the skeleton of cyclopenta[a]phenanthrene or a skeleton derived therefrom by one or more bond scissions or ring expansions or contractions.; Hill RA; Makin HL; Kirk DN; Murphy GM (1991). Dictionary of Steroids (1st ed.). London: Chapman & Hall. ISBN 978-0-412-27060-4.
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A compound derived from a steroid in which there has been a ring cleavage.
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