Strong's #1827: dmamah (pronounced dem-aw-maw')
feminine from 1826; quiet:--calm, silence, still.
Brown-Driver-Briggs Hebrew Lexicon:
ּ
demâmâh
1) whisper, calm
Part of Speech: noun feminine
Relation: from H1826
Usage:
This word is used 3 times:
1 Kings 19:12: "in the fire: and after the fire a still small voice."
Job 4:16: "thereof: an image was before mine eyes, there was silence, a voice,"
Psalms 107:29: "He maketh the storm a calm, so that the waves thereof are still."