Terpenes or terpenoids are a major and very broad group of medicinal plant constituents.
Let's step through from the entirely most simple, terpenes; monoterpenes, sesquiterpenes, diterpenes, and triterpenes, to the also very significant larger terpenoids. We'll touch on themes of slight hormonal and endocrine influence, as well as the most immediately sensed qualities of the wide range of terpenes, from aromatic to hormonal to nutritional, and how and why there is so much overlap in constituents that are of interest to plants to make, and medicinal effects on our body, and on other organisms that are significant to human disease. Step right up, and don't get stuck. This is about a 40-minute spoken casual introductory lesson. 

-Heather Irvine (Sound Wise About Medicinal Plants) 

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