Hittorf's phosphorus

== English == === Etymology === Named after Johann Wilhelm Hittorf (1824-1914) who first produced it in 1865. (Reference: John Emsley, The Shocking History of Phosphorus, 2000, →ISBN, page 304.) === Noun === Hittorf's phosphorus (uncountable) (inorganic chemistry) A purple crystalline allotrope of phosphorus.