Dormitive is a relatively less-used word that means "sleep-inducing" or "causing drowsiness." It is derived from the Latin term 'dormire' which means "to sleep." Some of the synonyms for dormitive include hypnotic, sedative, somniferous, soporific, narcotic, anodyne, calmative, tranquillizing, and tranquilizing. These terms are commonly used in the medical and pharmaceutical industry to describe medications that have a sleep-inducing effect. Other words that can be used to express the same meaning as dormitive include sleep-promoting, sleep-enhancing, and sleep-aiding. It's essential to understand the nuances of these words to use them correctly and avoid confusion in communication.