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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.
Definition of treble for Students. 1  1 : the highest part in harmony having four parts : soprano. 2  2 : an instrument having the highest range or part. 3  3 : a voice or sound that has a high pitch.  4 : the upper half of the musical pitch range.