The length of breadth of a finger used as a linear measure WordNet 3.0 & Open English WordNet

The digit or finger is an ancient and obsolete non-SI unit of measurement of length. Wikipedia

A finger is any of several units of measurement that are approximately the width of an adult human finger, including: The digit, also known as digitus or digitus transversus, dactyl or dactylus, or finger's breadth — 3⁄4 of an inch or 1⁄16 of a foot. Wikipedia

An ancient measurement unit Wikipedia Disambiguation

A measurement based on the width of a finger Wikipedia Disambiguation

Unit of length Wikidata

A unit of length notionally based upon the width of an adult human finger, standardized differently in various places and times, (especially) the English digit of 1⁄16 foot (about 1.9 cm). Wiktionary

Unit of length. Wiktionary (translation)

Various units of measure based or notionally based on the adult human finger, particularly. Wiktionary

A (usually approximate and informal) unit of measurement based upon the radial width of the human finger. Wiktionary