The spelling of the word "helenine" appears bizarre to some individuals due to its unusual consonant clusters. However, the spelling can be explained by its pronunciation. "Helenine" is pronounced as /hɛl.ən.aɪn/, with stress on the second syllable. The first two letters, "he", create the /hɛ/ sound, followed by the L sound represented by the letter L. The next two syllables contain the vowel E, represented by the letter E, followed by a nasal consonant /n/. Lastly, the word ends in the sound represented by the letter I, followed by the letter N.
A substance like camphor obtained from the plant elecampane.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.