Medical Root

somn/o

sleep

From Latin somnus, sleep

Meaning

What does somn/o mean?

somn/o is a root meaning sleep. It comes from Latin somnus, sleep.

Inside words it is spelled somn.

The same Latin root gives insomnia (in-, not) and somnolence, meaning drowsiness.

In real words

polysomnogram
a set of recordings made during sleep, such as brain waves, breathing and heart rate, used to diagnose sleep disorders
hypersomnia
a tendency to sleep too much or to feel excessively sleepy
parasomnia
an abnormal event that disrupts sleep, such as sleepwalking, sleep talking or nightmares

Sources

Written for biofideX in plain words, after checking these references:

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Practice it

somn/o is one of 9 parts in this lesson. Learn them together, then take real words apart.