adjective Botany, Zoology.
covered with a frostlike bloom or powdery secretion, as a plant surface.

1820–30; < Latin pruīnōsus frosty, equivalent to pruīn(a) frost (akin to freeze) + -ōsus -ose1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pruinose (ˈpruːɪˌnəʊs, -ˌnəʊz)
botany coated with a powdery or waxy bloom
[C19: from Latin pruīnōsus frost-covered, from pruīna hoarfrost]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Older males develop a pale pruinose blue color dorsally and more slowly laterally on the thorax and over the entire abdomen.
Females become pruinose, but much more slowly than males.
Mature males are pruinose blue on the thorax and abdomen.
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