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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.
Description [edit]. Barnacles are encrusters, attaching themselves permanently to a hard substrate. The most common, acorn barnacles (Sessilia), are sessile, growing their shells directly onto the substrate. The order Pedunculata ( goose barnacles  and others) attach themselves by means of a stalk.