Webster's Revised Unabridged Dictionary · 1913

Tart

Tart , adjective

[Anglo-Saxon teart. r63. Compare Tear, transitive verb]

1.
Sharp to the taste; acid; sour; as, a tart apple.
2.
Figuratively: Sharp; keen; severe; as, a tart reply; tart language; a tart rebuke.
Why art thou tart, my brother? — Bunyan

Tart , noun

[Old English tarte, French tarte; perhaps originally the same word as tourte, Late Latin torta, from Latin tortus, past participle of torquere to twist, bend, wind, because tarts were originally made of a twisted shape. Compare Torture, n.]

A species of small open pie, or piece of pastry, containing jelly or conserve; a sort of fruit pie.