The word "kosslyn" is spelled with two S's and a Y, and is pronounced /ˈkɒzlɪn/ in IPA phonetic transcription. The first syllable is pronounced with a short vowel sound, followed by the "s" sound in the second syllable. The second "s" helps to show the correct pronunciation of the "z" sound in the word. Finally, the "y" acts as a vowel and completes the final syllable. Remembering the correct spelling of "kosslyn" can help you to properly communicate this word in both written and spoken English.