What does "treacle" mean?

Additional senses

1. 2.Molasses; sometimes, specifically, the molasses which drains from the sugar-refining molds, and which is also called sugarhouse molasses. Note: In the United States molasses is the common name; in England, treacle.
2. 3.A saccharine fluid, consisting of the inspissated juices or decoctions of certain vegetables, as the sap of the birch, sycamore, and the like. Treacle mustard (Bot.), a name given to several species of the cruciferous genus Erysimum, especially the E. cheiranthoides, which was formerly used as an ingredient in Venice treacle, or theriac. -- Treacle water, a compound cordial prepared in different ways from a variety of ingredients, as hartshorn, roots of various plants, flowers, juices of plants, wines, etc., distilled or digested with Venice treacle. It was formerly regarded as a medicine of great virtue. Nares. Venice treacle. (Old Med.) Same as Theriac, 1.