From odi (“to snow”).
ôd m (uncountable)
Unusually for a monosyllabic word ending in a monophthong and single d, the current spelling of this (rare) word requires the circumflex to indicate that the vowel is long. Likewise, there is no grave accent in the word od to show that its vowel is short. Compare this to regular spellings such as mwd and mẁd or nod and nòd.
|Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.|
- R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke et al., editors (1950–present), “ôd”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies