| Term | Abbreviated Definition | Reference |
| carrier oil | Also known as base oil or vegetable oil. Used to dilute essential oils and absolutes before they are applied to the skin in massage and aromatherapy. | Reference |
| circadian day | Any biological process that displays an endogenous, entrainable oscillation of about 24 hours. | Reference |
| Lavender | An essential oil from the plant | More Reading |
| prana | The Sanskrit word that refers to all cosmic energy or “life force” permeating the Universe on all levels. | Reference |
| ultradian cycles | A recurrent period or cycle repeated throughout a 24-hour circadian day. | Reference |
