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Webster 1913 Edition

Noun.

A taste which remains in the mouth after eating or drinking.

See also: after-taste and after taste

aftertaste ‎(plural aftertastes)

A taste of something that persists when it is no longer present.
The persistence of the taste of something no longer present.
Many people think certain artificial sweeteners have an unpleasant aftertaste.
Of wine, finish.

The persistence of the taste of something no longer present

Of wine, finish