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troedfedd [Welsh]

In Wales, a unit of length = 9 modfedd. For all practical purposes, = 9 English inches, 22.9 centimeters. This term is often translated “foot,” but note it is only ¾ the length of a foot.

sources

5. And that measure Dyvnwal measured by a barley corn: three lengths of a barley corn in the modfedd; three modfeddi in the palm breadth; three palm breadths in the troedfedd; three troedfeddi in the pace; three paces in the leap; three leaps in a land, the land, in modern Welsh, is called a ridge; and a thousand of the lands is a mile. And that measure we still use here.

The Commissioners of the Public Records of the Kingdom.
Ancient Laws and Institutes of Wales; Comprising Laws Supposed to be enacted by Howel the Good, Modified by subsequent regulations under the Native Princes Prior to the Conquest by Edward the First: and anomalous Laws, Consisting Principally of Institutions which by the Statute of Ruddlan were admitted to continue in force: With an English Translation of the Welsh Text. to which are added A Few Latin Transcripts, containing digests of the Welsh laws, principally of the Dimetian Code. With Indexes and Glossary. Volume I.
London: Printed by Command of His Late Majesty King William IV, 1841.
The Vendotian Code, Book II, Chapter XVII. Of the laws of Dyvnwal Moel Mud, and of measure. We have de-anglicized the names of some units in their translation.