hersenbreker

== Dutch == === Etymology === Compound of hersenen (“ brain”) +‎ breken (“to break”) +‎ -er. === Pronunciation === IPA(key): /ˈɦɛr.sə(n)ˌbreː.kər/ Hyphenation: her‧sen‧bre‧ker === Noun === hersenbreker m (plural hersenbrekers, no diminutive) a particularly difficult puzzle or problem Synonym: hersenkraker