different between terpenoid vs secosteroid

English

terpene +? -oid

terpenoid (plural terpenoids)

(organic chemistry) A very large class of naturally occurring and synthetic organic compounds formally derived from the hydrocarbon isoprene; they include many volatile compounds used in perfume and food flavours, turpentine, the steroids, the carotene pigments and rubber.

(L. seco, "to cut")

secosteroid (plural secosteroids)

(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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