Welsh

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Welsh numbers (edit)
 ←  70  ←  79 80 81  →  90  → 
8
    Cardinal (decimal): wyth deg, (optionally before a nasal or vowel) wyth deng
    Cardinal (vigesimal): pedwar ugain
    Ordinal: pedwar ugeinfed
    Ordinal abbreviation: 80fed

Adjective

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80fed

  1. Abbreviation of pedwar ugeinfed.: 80th