tair ar bymtheg

Welsh

Welsh numbers ^(edit)

[a], [b], [c] ←  17	18	19  → [a], [b], [c]
Cardinal (feminine / vigesimal): tair ar bymtheg, ugain namyn dwy     Cardinal (decimal): un deg wyth     Cardinal (vigesimal): deunaw     Ordinal (masculine / vigesimal): trydydd ar bymtheg     Ordinal: deunawfed     Ordinal abbreviation: 18fed
Welsh Wikipedia article on 18

Etymology

From tair (“three”) +‎ ar (“on”) +‎ pymtheg (“fifteen”).

Pronunciation

• (North Wales, standard, colloquial) IPA^(key): /ˌtai̯r ar ˈbəmθɛɡ/
  • (North Wales, colloquial) IPA^(key): /ˌtai̯r ar ˈbəmθaɡ/
• (South Wales) IPA^(key): /ˌtai̯r ar ˈbəmθɛɡ/

Numeral

tair ar bymtheg f

1. (cardinal number, vigesimal) feminine of tri ar bymtheg

   Synonyms: un deg wyth, deunaw

   • 1872 December 6, “Amgylchiad Gofidus”, in Y Dydd, page 4:

     Gwasanaethai merch ieuanc, tair ar bymtheg oed, o'r enw Elizabeth Rees, gyda Mr. Mitchell, yn Dylogau — fferm ar lan yr afon Ystwyth, Ceredigion.

     A young woman, eighteen* years of age, by the name of Elizabeth Rees, was in service with Mr Mitchell in Dolygau at a farm on the river Ystwyth in Cardiganshire.

     The Cambrian News and Merionethshire Standard of the same date says that she was 23 years old.

Mutation

Welsh mutation
radical	soft	nasal	aspirate
tair ar bymtheg	dair ar bymtheg	nhair ar bymtheg	thair ar bymtheg
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.