The article dwells on the analysis of the reflection of the problems of phonetics, spelling and orthoepy in particular, in Sirojiddin Alikhon Orzu’s “Charoghi hidoyat” – the lexicographic production of the first half of the 18th centuny. Proceeding from the studied contents of “Charoghi hidoyat” phraseological dictionary, the author of the article comes to the conclusion that Orzu introduced some new notions into the stock of grammatical and phonetical terms of his time. He also asserts and confirms his assertions with documents running to the effect that Orzu was the first lexicographer who contributed orthoepic description of separate cerebral sounds of the Indian language into his dictionary.