The word "Royalene" is spelled as [rɔɪəliːn], according to the International Phonetic Alphabet. The first syllable is pronounced as "roy", with the diphthong /ɔɪ/ representing the sound in words like "coin" or "join". The second syllable is pronounced as "uh-leen", with a long /iː/ sound in the vowel. This spelling accurately reflects the pronunciation of the word, which is a brand name for a type of synthetic resin used in plastics manufacturing.