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Definition of Soxhlet extractor
1. Noun. (chemistry) A piece of laboratory apparatus consisting of a glass reservoir that sits over a lower flask (containing a boiling solvent) and under a condenser; a sample contained in a paper thimble is placed in the reservoir and soluble materials are continually extracted by the warm solvent and transferred to the lower flask via a siphon. ¹
¹ Source: wiktionary.com