an instrument that displays the prismatic colours, consisting of a polished black glass which is breathed upon via a tube
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a polished black glass, the surface of which becomes iridescent when it is breathed upon through a tube.See also: Color, Light
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