The spelling of the word "tomatsu" is fairly straightforward if you are familiar with the International Phonetic Alphabet (IPA). The IPA transcription for "tomatsu" is /toʊmætsu/, which breaks down as follows: the "t" sound at the beginning is followed by a long "o" sound, then an "m" and "a" sound. The "t" sound is repeated before another "s" and "u" sound. This word is commonly used in the context of Japanese cuisine as a seasoning made from a type of yuzu fruit.