dephlegmation

from The Century Dictionary.

• noun The operation of separating water from spirits and acids by evaporation or repeated distillation; concentration.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.), obsolete The operation of separating water from spirits and acids, by evaporation or repeated distillation; -- called also concentration, especially when acids are the subject of it.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry, obsolete The operation of separating water from spirits and acids, by evaporation or repeated distillation; concentration.