SLUIS is a Dutch word pronounced as [slœys]. The word refers to a sluice or lock, which is a water channel control device. The spelling of the word is notable for its combination of two consecutive vowel clusters {UI and EI}. In Dutch orthography, this is represented by the letters U and I respectively. The letter S in the word is pronounced as it is in English while the letters L, U, and I are pronounced differently. This unique combination of letters results in a distinctive Dutch sound.