| 释义 |
‖ pappus|ˈpæpəs|
[mod.L., a. Gr. πάππος.]
1. Bot. The downy or feathery appendage on certain fruits, esp. on the achenes or ‘seeds’ of many Compositæ, as thistles, dandelions, etc.; hence extended to the reduced calyx of Compositæ generally, whether downy, bristly, scaly, toothed, or membranous.
1704J. Harris Lex. Techn. I, Pappus, in Botany, is that soft light Down, which grows out of the Seeds of some Plants, such as Thistles, Dandelion, Hawkweed, etc. 1811A. T. Thomson Lond. Disp. (1818) 405 The capsule is crowned with a feathery pappus. 1866Treas. Bot. 844/2 Pappus, the calyx of composites, in which that organ is reduced to a membrane, or scales, or hairs, or a mere rim.
Comb.1847W. E. Steele Field Bot. 22 Cal. with a superior membranous or pappus-like limb. 1870Hooker Stud. Flora 212 Tragopogon..pappus-hairs in many series. Ibid. 188 Centaurea nigra..pappus-scales short unequal or O.
2. Anat. (See quots.)
1857Mayne Expos. Lex., Pappus. Anat. Term for the first downy beard of the chin. 1893Syd. Soc. Lex., Pappus... Also, the downy hair of the skin and cheeks. |
单词 hotbed 释义 hotbed n 1 bed of earth heated by rotting manure to help plants to grow （......