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Treacle was an old English word for medicine, and was also used to describe dark coloured undrinkable water, which from its foul palate was associated with the commonly held taste of medicine. Consequently a well where the water became undrinkable would be termed a âtreacle wellâ.
Four more plates form a door which the barnacle can open or close, depending on the tide. When the tide goes out, the barnacle closes shop to conserve moisture. As the tide comes in, a muscle opens up these four plates, and the feathery legs of the barnacle sift the water for food.