The word "arrhenal" is spelled with a double "r" and a single "n". Its phonetic transcription in the International Phonetic Alphabet (IPA) is: /əˈriːnəl/. The first syllable is a schwa sound followed by a long "e" sound. The second syllable has a clear "n" sound at the beginning followed by a short "a" sound and a final "l" sound. The word "arrhenal" refers to a type of organic compound containing arsenic and was first used in the late 19th century.
Sodii methylarsenas, arsenyl.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.