The word "reiher" is a German term that refers to a heron bird. It is pronounced as /ˈʁaɪ̯hɐ/ in IPA phonetic transcription. The first letter "r" is pronounced with a guttural, rolling sound, while "ei" is pronounced as a long "i" sound, and "h" is pronounced as a silent letter. The second "e" in "reiher" is pronounced as a short "e" sound, and the final letter "r" is again pronounced with a guttural, rolling sound. Overall, the spelling of "reiher" accurately reflects its pronunciation in German.
The word "reiher" is derived from the Middle High German term "reiger", which can be traced back to the Old High German "reigaro". This German word ultimately comes from the Old High German "reihs", which meant "heron". The Old High German term was borrowed from the Proto-Germanic "hraigrǭ", with a similar meaning of "heron". The Proto-Germanic word, in turn, is believed to have originated from the Proto-Indo-European root "*krowh₂-", meaning "bird".