See also: Duìmǎ and duìmà
Ido numbers (edit)
20
 ←  1 2 3  → 
    Cardinal: du
    Ordinal: duesma
    Adverbial: dufoye
    Multiplier: duopla
    Fractional: duima

Etymology

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du (two) +‎ -ima

Adjective

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duima

  1. half