Keréken
Keréken is the locative form of the Hungarian noun kerék, meaning wheel. It denotes a position on or atop a wheel and is used to describe location in space in Hungarian, particularly in contexts involving wheels, wheel-driven mechanisms, or wheel-like structures. The form is created by adding the locative suffix -en to the stem kerék, yielding keréken. It follows standard Hungarian vowel harmony and is one of several locative forms that attach to nouns to indicate location, with -on, -en, and -ön varying according to the preceding vowel and consonant.
In practice, keréken appears in technical writing, such as mechanical descriptions, assembly guides, or parts lists,
Etymology traces keréken to kerék (wheel) plus the locative suffix -en, a productive combination in Hungarian