noun Mineralogy.
a leek-green cryptocrystalline variety of chalcedony.

1350–1400; < French < Latin prasius leek-green stone < Greek prásios leek-green, derivative of práson leek; replacing Middle English prassius < Latin, as above Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prase (preɪz)
a light green translucent variety of chalcedony
[C14: from French, from Latin prasius a leek-green stone, from Greek prasios, from prason a leek]

Collins English Dictionary - Complete & Unabridged 10th Edition
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