dwy ar bymtheg

Welsh

**Welsh numbers ^(edit)**
^{[a], [b]} ← 16	17	18 → ^{[a], [b], [c], [d]}
Cardinal (feminine / vigesimal): dwy ar bymtheg Cardinal (masculine / vigesimal): dau ar bymtheg Cardinal (decimal): un deg saith Ordinal (feminine / vigesimal): ddwyfed ar bymtheg, dwyfed ar bymtheg Ordinal (masculine / vigesimal): ddeufed ar bymtheg, deufed ar bymtheg Ordinal: ail ar bymtheg, eilfed ar bymtheg Ordinal abbreviation: 17eg
Welsh Wikipedia article on 17

From dwy (“two”) +‎ ar (“on”) +‎ pymtheg (“fifteen”).

(North Wales, standard, colloquial) IPA^(key): /ˌduːɨ̯ ar ˈbəmθɛɡ/
- (North Wales, colloquial) IPA^(key): /ˌduːɨ̯ ar ˈbəmθaɡ/
(South Wales) IPA^(key): /ˌdʊi̯ ar ˈbəmθɛɡ/

dwy ar bymtheg f

The vigesimal dwy ar bymtheg can only be used with feminine nouns whereas the synonymous decimal un deg saith can be used with nouns of any gender.

Welsh mutation
radical	soft	nasal	aspirate
dwy ar bymtheg	ddwy ar bymtheg	nwy ar bymtheg	unchanged
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.