| 释义 |
powdery, a.|ˈpaʊdərɪ|
[f. powder n.1 + -y.]
1. a. Of the nature or consistence of powder; consisting of fine loose particles; pulverulent; dusty.
1426Lydg. De Guil. Pilgr. 10107 Wyth powdry sondys out off noumbre, Wych hyr passage so encoumbre. 1767Percival in Phil. Trans. LVII. 230 A considerable portion of it..subsided in a powdery form to the bottom of the glass. 1799Wordsw. Lucy Gray vii, Her feet disperse the powdery snow, That rises up like smoke. 1884Bower & Scott De Bary's Phaner. 562 The cells..forming, especially when dry, a loose, powdery mass.
b. Easily disintegrated into powder; friable.
a1728Woodward Fossils II. 36 A brown, powdery Spar. They say it holds Iron. Found amongst the Iron-Ore.
†2. Of the nature of gunpowder; inflammable, explosive. Obs.
1611Speed Hist. Gt. Brit. ix. xx. §14 The lighted matches of sedition found powdry spirits, and wonderfull correspondence.
3. Covered with or full of powder; having a deposit of powder; dusty.
1708Ozell tr. Boileau's Lutrin 48 When from his Powdry Roost the Bird of Night..takes his Flight. 1784Woodward in Phil. Trans. LXXIV. 423 The powdery head is covered with a loose campanulated cap. 1872Geo. Eliot Middlem. lix, That pollen which the bees carry off (having no idea how powdery they are). 1874Symonds Italy & Greece 291 Delicate golden auriculas with powdery leaves and stems. 1879St. George's Hosp. Rep. IX. 738 The skin is everywhere wonderfully white, in some regions raised into little powdery eminences.
4. Comb., as powdery-looking; powdery mildew, a parasitic fungus belonging to the family Erysiphaceæ, or the disease it causes in plants, characterized by a white, floury covering of conidia on the parts attacked.
1875Huxley & Martin Elem. Biol. (1877) 38 Note the powdery-looking upper surface, white in young specimens. 1889Jrnl. Mycol. V. 214 (heading) Powdery mildew of the bean. 1913G. & I. Massee Mildews, Rusts & Smuts 36 The entire group [sc. Erysiphaceæ] is often spoken of as powdery mildews, on account of the dense masses of conidia that are produced, and rest on the white patches of mycelium, giving them the appearance of having been sprinkled with flour. 1936Jrnl. Agric. Res. LII. 645 (title) The diurnal cycle of the powdery mildew Erysiphe polygoni. 1978P. P. Pirone Dis. & Pests Ornamental Plants (ed. 5) i. 9/2 Powdery mildews are fungi that grow superficially on the leaves and stems of their hosts. |