ˈ ̷ ̷ˌ ̷ ̷ noun
1.
a. : a circular hole formed in the rocky bed of a river or stream by the grinding action of stones or gravel whirled round by the water — called also kettle
b. : a pot-shaped hole in the surface of a pavement
c. : a circumscribed body of water frequented by wildfowl
2. : a deep cave opening upward to the surface