Serbo-Croatian

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Serbo-Croatian numbers (edit)
 ←  17 18 19  → 
    Cardinal: osamnaest
    Ordinal: osamnaesti
    Multiplier: osamnaestostruk
    Collective: osamnaestoro, osamnaestorica
    Fractional: osamnaestina

Etymology

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From ȍsam (eight) +‎ na (on) +‎ dȅset (ten). Cognates include Slovene osemnájst.

Numeral

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osàmnaēst (Cyrillic spelling оса̀мнае̄ст)

  1. eighteen

Usage notes

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This number is indeclinable. It governs the genitive plural of the noun.