1719-Daniel Defoe, ...after a little way out to sea, there was a current and wind, always one way in the morning, the other in the afternoon. This I understood to be no more than the sets of the tide, as going out or coming in; but I afterwards understood it was occasioned by the great draft and reflux of the mighty river Orinoco...
(chemistry) a technique, using a reflux condenser, allowing one to boil the contents of a vessel over an extended period
