deu-

See also: Appendix:Variations of "deu"

Welsh

Etymology

From Middle Welsh deu, from Old Welsh dou, from Proto-Brythonic *dọw, from Proto-Celtic *duwo, from Proto-Indo-European *dwóh₁. Corresponds to dau m (“two”).

Pronunciation

Prefix

deu-

  1. two-, bi-, di-, duo-
    Synonym: dwy-
    ‎deu- + ‎llawr (“floor”) → ‎deulawr (“two-storey”)
    ‎deu- + ‎pegwn (“pole”) → ‎deubegwn (“bipolar”)
    ‎deu- + ‎rhyw (“sex”) → ‎deuryw (“bisexual, hermaphrodite”)

Usage notes
  • Used to form compounds with masculine nouns, the corresponding feminine suffix being dwy-.

Derived terms
Welsh terms prefixed with deu-

Mutation
Welsh mutation
radical soft nasal aspirate
deu- ddeu- neu- unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

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