Etymology
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mitt (n.)

1765, shortened form of mitten (q.v.) in the fashionable sense of "glove without fingers or with very short fingers of black lace or knitted silk, worn by women." In the more general sense of "glove without a separate covering for each finger" by 1812. Baseball sense of "protective glove for a pitcher, catcher, or fielder" is from 1902. Slang sense of "hand" is from 1896. Slang mitt-reader for "fortune teller" is by 1928.

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Definitions of mitt

mitt (n.)
the (prehensile) extremity of the superior limb;
he extended his mitt
Synonyms: hand / manus / paw
mitt (n.)
the handwear used by fielders in playing baseball;
Synonyms: baseball glove / glove / baseball mitt
From wordnet.princeton.edu