erw

Borrowed from Welsh erw.

• IPA^(key): /ˈɛɹuː/

erw (plural erws or erwau)

1. (historical) A medieval Welsh unit of surface area equal to 11664 sq ft, or about ¼ acre.

• Rew, WER, rew, wer

From Proto-Celtic *arwī (compare Breton erv, Cornish erow), from Proto-Indo-European *h₂erh₃-wo- (“plowable”) (compare Old Irish arbor, Latin arvum).

• (North Wales) IPA^(key): /ˈɛru/
• (South Wales) IPA^(key): /ˈeːru/, /ˈɛru/

erw f (plural erwau)

1. acre

   Synonyms: acer, cyfair

2. (obsolete) medieval Welsh unit of surface area equal to 11664 sq. ft. or about ¹⁄₄ acre^[1]

• R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “erw”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies