Finger (unit)

Width of knuckle of middle finger

Some hand-based measurements, including the finger. A chart of Imperial and US customary units.

A finger (sometimes fingerbreadth or finger's breadth) is any of several units of measurement that are approximately the width of an adult human finger. [Exactly which part of the finger should be used is not defined; the width at the base of fingernail (#6 in the sketch) is typically less than that at the knuckle (#5).]

The digit, also known as digitus or digitus transversus (Latin), dactyl (Greek) or dactylus, or finger's breadth - 3⁄4 of an inch or 1⁄16 of a foot.[1][2] (about 2 cm)

In medicine and related disciplines (anatomy, radiology, etc.) the fingerbreadth (literally the width of a finger) is an informal but widely used unit of measure.[3][4]

In the measurement of distilled spirits, a finger of whiskey refers to the amount of whiskey that would fill a glass to the level of one finger wrapped around the glass at the bottom.[5][6][7]

Another definition (from Noah Webster): "nearly an inch."[8][9]

Finger is also the name of a longer unit of length, used historically in cloth measurement, to mean one eighth of a yard or 4⁠1/2⁠ inches.[8][10] (114.3 mm) Again, which finger and whose finger, is not defined.

These units have no legal status but remain in use for 'rough and ready' comparisons.

## See also

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* Digit (unit) ('6' in the diagram above)
* Finger tip unit – Unit of ointment dosage in Medicine
* English units – System of units formerly used in England (before 1826)
* Imperial units – System of measurements (from 1826)
* United States customary units – Units of measurement commonly used in the U.S.

## References

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1. ^ Noah Webster; John Walker (1830). American dictionary of the English language. digit: Converse. p. 247. Retrieved 15 January 2012.
2. ^ Ronald Edward Zupko (1985). A dictionary of weights and measures for the British Isles: the Middle Ages to the twentieth century. American Philosophical Society. pp. 109–10. ISBN 978-0-87169-168-2.
3. ^ The American Journal of the Medical Sciences. Charles B. Slack. 1839. p. 363. Retrieved 15 January 2012.
4. ^ David V. Skinner (28 April 1997). Cambridge textbook of accident and emergency medicine. Cambridge University Press. p. 1209\. ISBN 978-0-521-43379-2. Retrieved 15 January 2012.
5. ^ University chronicle. 1858. p. 187. Retrieved 15 January 2012.
6. ^ Bret Harte (1899). "A Jack and Jill of the Sierras". McClure's magazine. S.S. McClure Co. p. 230.
7. ^ Harvard Student Agencies, Inc. The official Harvard Student Agencies bartending course. Macmillan. p. 38. ISBN 978-0-312-25286-1.
8. ^ a b Noah Webster (1896). Webster's collegiate dictionary. G. & C. Merriam. p. 332. Retrieved 14 January 2012.
9. ^ William Markham (1739). A general introduction to trade and business: or, The young merchant's and tradesman's magazine ... A. Bettesworth and C. Hitch. p. 104.
10. ^ The Encyclopedia Americana. Encyclopedia Americana Corp. 1920. p. 165.

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