The spelling of the word "Prosiphon" is quite complex, but it can be easily explained with the help of IPA phonetic transcription. The first syllable "pro" is pronounced as /prəʊ/, while the second syllable "si" is pronounced as /saɪ/. The final syllable "phon" is pronounced as /fɒn/. Combining all of these together, the correct pronunciation of "Prosiphon" would be /prəʊ.saɪ.fɒn/. This word is often used in biology and refers to a type of feeding tube found in certain marine invertebrates.