háčekEnglishOxford New American Dictionaryháček /ˈhaˌCHek, , ˈhæˌtʃɛk , ˈhäCHek, ˈhɑtʃɛk / ▸ noun a diacritic mark (ˇ) placed over a letter to indicate modification of the sound in Slavic and other languages. – ORIGIN Czech, diminutive of hák ‘hook’.