Meaning: Soporific is used as an adjective as well as a noun. It refers to something that tends to induce drowsiness or sleep.
Origin: Soporific comes from Latin sopor meaning “deep sleep” and fic, an adjective forming suffix meaning “making or producing”. That root is related to somnus, the Latin word for “sleep.” Remember words such as “somnambulism” and “insomnia” also have their roots in somnus. The term soporific has been in use in English since the mid-17th Century.
Usage: The motion of the bus has a soporific effect on some commuters.
A glass of warm milk at bedtime is considered a soporific as it induces sleep
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