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Cardinal: achtzehn Ordinal: achtzehnte Sequence adverb: achtzehntens Ordinal abbreviation: 18. Adverbial: achtzehnmal Adverbial abbreviation: 18-mal Multiplier: achtzehnfach Multiplier abbreviation: 18-fach Fractional: Achtzehntel Polygon: Achtzehneck Polygon abbreviation: 18-Eck Polygonal adjective: achtzehneckig Polygonal adjective abbreviation: 18-eckig | ||
German Wikipedia article on 18 |
From Old High German ahtozehan, from Proto-Germanic *ahtōutehun, equivalent to acht + zehn. Compare Dutch achttien, West Frisian achttjin, English eighteen, Danish atten.
achtzehn
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