The word "IDER" might seem peculiar, but its spelling actually follows the rules of English phonetics. The IPA phonetic transcription of "IDER" is /ˈaɪdər/, which indicates that the first syllable should be pronounced like the "i" in "bike" and the second syllable should sound like "duh" without the "u" sound. This means that the correct pronunciation of "IDER" is "EYE-duh". So if you come across this word, don't be thrown off by its unusual spelling - just remember to pronounce it phonetically!