syr·up also sir·up (sĭrəp, sûr-)
1. A thick, sweet, sticky liquid, consisting of a sugar base, natural or artificial flavorings, and water.
2. A thick, sugary liquid made by boiling down or otherwise concentrating plant sap, juice, or grain extracts.
3. A concentrated solution of sugar in water, often used as a vehicle for medicine.
[Middle English sirup, from Old French sirop, from Medieval Latin siropus, from Arabic šarāb, from šariba, to drink; see śrb in the Appendix of Semitic roots.]
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