delta rhythm
delta wave

There are also high-voltage delta waves in somnambulists up to 17 years of age.

They go from alpha waves to delta waves, in a little dip.

The delta wave will kill anything in its path, but needs time to charge up.

They file into the control room as the Doctor is about to fire the delta wave.

K-Complexes have been shown to immediately precede delta waves in slow wave sleep.

In addition, delta waves show a lateralization, with right hemisphere dominance during sleep.

By the age of about 75, stage four sleep and delta waves may be entirely absent.

Slow waves, including delta waves, are associated with seizure-like activity within the brain.

We need to see what the delta wave was being used to do to Taran'atar.

I hadn't planned to sleep on the plane: you don't hit the same delta waves.