The spelling of the word "novarsenobillon" can be quite baffling for those unfamiliar with its components. It is a combination of the Latin words "nova," meaning "new," "arseno," meaning "arsenic," and "billon," meaning "alloy." The correct pronunciation of "novarsenobillon," using IPA phonetic transcription, would be /noʊvɑɹsɛnoʊbjɪljən/. Despite its complexity, this word is rarely used in everyday language and is usually reserved for scientific or technical contexts.
Novarsenobenzol.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.