Etymology
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thimble (n.)

Old English þymel "sheath or covering for the thumb," from thuma (see thumb (n.)) + instrumental suffix -el (1), used in forming names of tools (compare handle (n.)). The unetymological -b- appears mid-15c. (compare humble, nimble, etc.). Originally of leather, metal ones came into use 17c. Related: Thimbleful. Thimblerig, con game played with three thimbles and a pea or button, is attested from 1825 by this name, though references to thimble cheats, probably the same swindle, date back to 1716 (see rig (v.)).

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Definitions of thimble

thimble (n.)
as much as a thimble will hold;
Synonyms: thimbleful
thimble (n.)
a small metal cap to protect the finger while sewing; can be used as a small container;
From wordnet.princeton.edu