secosteroid

/S EH1 K AA1 S T ER0 OY1 D/
noun
  1. 1

    (organic chemistry) Any of the subclass of many terpenoid compounds of the tetracyclic steroid class that are structural relatives bearing a cleavage of one of the four rings of that parent class. The prototypical secosteroid is cholecalciferol, vitamin D3.

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