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flos ferri

British  
/ ˈflɒs ˈfɛrɪ /

noun

  1. a variety of aragonite that is deposited from hot springs in the form of a white branching mass

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of flos ferri

C18: from New Latin, literally: flower of iron

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