Origin: a Latin derivative 
meaning "Gift of the Earth."
 
Ketones are very similar to aldehydes as they also feature an oxygen with a double bond; however, this functional group always occurs somewhere in the middle of a carbon chain rather than on the end. Ketones can be identified from their scientific name, which usually end with the suffix “-one.” Common ketones found in essential oils are carvone and menthone.
Main Health Effects:
| Essential Oil | Main Ketone Constituent(s) | Amount | 
| Dill2,4* | carvone | Approximately 50% | 
| Peppermint 3*,4* | menthone | Approximately 15% | 
| Rosemary 2,3*,4* | camphor | Approximately 10% | 
| Fennel 2,3*,4* | frenchone | Approximately 5% | 
| Lavender 1,2 | octanone | Approximately 5% |