The word "anadidymus" may at first glance appear to be difficult to spell, but it can be broken down quite simply with the help of IPA phonetic transcription. The first syllable "ana" is pronounced /ˈænə/, which is followed by "di" pronounced /daɪ/, and lastly "dymus" pronounced /ˈdɪməs/. Put together, the word is pronounced /ˌænəˈdaɪdɪməs/. Despite its complicated appearance, breaking down the word into its phonetic components can make it easier to spell and pronounce correctly.
A double monster, united below but separated above.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.