📒 a barrier that is built across a river in order to stop the water from flowing, used especially to make a reservoir (= a lake for storing water) or to produce electricity
📒 an artificial lake where rain or spring water is collected and stored
📒 the mother of some animals, especially horses
📒 a small rubber sheet used by dentists to keep a tooth separate from the other teeth
📒 a small rubber sheet used to protect the mouth during sex