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Webster 1913 Edition

Noun.

The quality or state of being tart.

Syn. – Acrimony; sourness; keenness; poignancy; severity; asperity; acerbity; harshness. See

Noun.

Acidity; sharpness to the taste; as the tartness of wine or fruit.

Sharpness of language or manner; poignancy; keenness; severity; as the tartness of rebuke.

tartness ‎(plural tartnesses)

characteristic of being tart