To take back.
To cede back; to grant or yield again to a former possessor.
To move back; to retreat; to withdraw.
To flow back or return.
To boil a liquid in a vessel having a reflux condenser
A technique, using a reflux condenser, allowing one to boil the contents of a vessel over an extended period.
The backwards flow of any fluid.
The leaking of stomach acid up into the oesophagus.