undec

Etymology
From.

Numeral

 * 1) eleven
 * 2) * traditional, ascribed to Taliesin, Yr awdl fraith, republished in Hugh James Rose and Samuel Roffey Maitland [eds.], The British Magazine, and Monthly Register of Religious and Ecclesiastical Information, Parochial History, and Documents Respecting the State of the Poor, Progress of Education, &c., volume 19, 1841, page 665 :
 * "wlm"
 * "wlm"

- Naw cànt dau undeg wyth Y bu yn ymlwyth Yn arwain mysg-lwyth,  Masgl a fæmina.