The word "filsten" is a German term referring to "cobblestone" in English. Its correct pronunciation is [ˈfɪlʃtən], where the first syllable "fil" is pronounced like the English word "fill" and the second syllable "sten" is pronounced like the English word "stone." The "sh" sound in the first syllable is represented by the German letter "ß" which is pronounced like "s" in English. The phonetic transcription helps to accurately understand the pronunciation of the word and pronounce it correctly.