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adj. Botany
Having a white, powdery covering or bloom.

[Latin pruīnōsus, frosty, from pruīna, hoarfrost; see preus- in Indo-European roots.]


(ˈpruːɪˌnəʊs; -ˌnəʊz)
(Botany) botany coated with a powdery or waxy bloom
[C19: from Latin pruīnōsus frost-covered, from pruīna hoarfrost]


(ˈpru əˌnoʊs)

covered with a frostlike bloom or powdery secretion, as a plant surface.
[1820–30; < Latin pruīnōsus frosty =pruīn(a) frost (akin to freeze) + -ōsus -ose1]
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References in periodicals archive ?
kunashirica Shatalkin, 1992 and Minettia (F) martineki Ceianu, 1991) on lower margin; mesonotum often with blackish gray pruinose stripes; scutellum often grayish white pruinosity on posterior margin; legs often black, rarely entirely yellow (in Minettia (F.
Oligopogon species tend to be heavily pruinose and the extent and distribution of apruinose areas provide useful characters in separating species.
Abdominal sterna II, III and lateral parts of IV heavily punctured, the others without punctation, covered with short, appressed macrotrichia, some parts pruinose.
2 cm wide (often nearly as wide as long), broadly ovate or elliptic, the lower ones acuminate, the upper ones acute, inflated, spreading and exposing the sepals, membranaceous, nerved, the adaxial ones glabrous, the abaxial ones coraline, densely and finely pruinose lepidote all over; sepals 1.
07") thick, ear shaped to convex fan shaped, texture is rubbery, upper surface is smooth to wrinkled, to velvety, with the lower surface smooth to veined, glabrous to pruinose, grayish brown to purplish brown, over all white to the tomentum.
The blue-gray, pruinose apothecia and green leprose thallus are good diagnostic features of this lichen.
25-27 mm long, 20 mm wide, sarcotesta yellow, not pruinose, 2 mm thick;
but is more obligately restricted to calcareous substrates, has a densely white pruinose upper cortex, and lacks zeorin.
5-4 cm broad; reddish- to olive-brown; surface dry and pruinose when young, becoming moist and smooth with age; margin: striate, upturned and often ragged.
Mesonotum: Extensively pruinose with following apruinose areas: postpronotal lobes, large lateral area anterior to transverse suture, extensive area postsuture that extends to much of postalar lobe, pair broad medial stripes extending almost to anterior margin, but falling far short of posterior margin.
DIAGNOSIS: Recognized by the shiny black basic coloration, brown antennal segment I and basal 1/5 of II, dense, silvery, reclining setae on anterior part of the totally blackened scutellum, anteriorly flattened and pruinose procoxa, well developed metafemur, widened posterior wall of bursae, and narrowed sclerotized rings.
catharinae that, when the scales fall off, leave exposed in certain places the pruinose layer which is deposited beneath them.