FromEsperanto-ujo, fromFrenchétui,GermanEtui. Also considered aback-formation frometuyo(masculine).^[1] Also paronym toetuyo.

-uyo

1. suffix used with a nominal root to denote a receptacle, ordinarily a case, box, chest or sheath

   ‎violino(“violin”) + ‎-uyo → ‎violinuyo(“violin case”)

Distinguish-uyo from-iero:sigaruyo = a case for cigars;sigariero = a short tube for smoking a cigar.

• etuyo(“case, box”)

• Ido terms derived from Esperanto
• Ido terms derived from French
• Ido terms derived from German
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• Ido noun-forming suffixes

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