One of the mysteries of the English language finally explained.
Either of two isomeric polycyclic compounds ("suprasterol I", "suprasterol II"), produced by prolonged ultraviolet irradiation of calciferol (vitamin D₂).
1930s; earliest use found in British Chemical Abstracts. From supra- + -sterol, after German Suprasterin; so called on account of the deliberately prolonged irradiation used to prepare the compounds.
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