The spelling of the word "Amethysum" can be a bit confusing, as it might be expected to be spelled "amethyst" instead. However, this spelling is actually an archaic form of the word, used in Middle English. The "u" in "Amethysum" is pronounced as the "oo" sound in "moon," while the "y" is pronounced as the "i" sound in "bit." Therefore, the IPA phonetic transcription for this word would be /əˈmɛθɪsəm/.
The word "amethyst" is derived from the ancient Greek word "amethustos", which means "not intoxicated" or "not drunk". In Greek mythology, it was believed that wearing or drinking from an amethyst vessel would prevent intoxication or drunkenness. The Greek word "amethustos" is a combination of "a-" (meaning "not") and "methyskein" (meaning "to be drunk"). Over time, the word evolved into "amethyst" in the English language and came to refer specifically to the purple variety of quartz.