| 释义 |
tripoli|ˈtrɪpəlɪ|
Also with capital initial, and 7 -ie, 7–8 -y, (8 tripela).
[= F. tripoli (16th c. in Godef. Compl.), f. Tripoli, a region in North Africa, or town of the same name in Syria, where found.]
1. a. A fine earth used as a polishing-powder, consisting mainly of decomposed siliceous matter, esp. that formed of the shells of diatoms; called also infusorial earth or rotten-stone.
1601Holland Pliny xxxv. vi. II. 530 Tripolie or goldsmiths earth. 1665Hooke Microgr. Pref., With a little Tripoly, rub them till they come to be very smooth. 1777G. Forster Voy. round World II. 355 A sort of tripoly, which is called rotten-stone by some miners. 1797Encycl. Brit. (ed. 3) VII. 608/2 The common tripela, or Tripoli, used to polish glass and stones. 1830Lyell Princ. Geol. I. 214 That admixture of clay and silica, called tripoli. 1869tr. Pouchet's Universe (1871) 21 Some tripolis of a red colour are employed in house-painting.
b. attrib.
1677Plot Oxfordsh. 78 That very lasting brightness..receiv'd from the Gold-smiths Tripoli-stone. 1825J. Nicholson Operat. Mechanic 755 To polish Varnish.—This is effected with pumice-stone and Tripoli earth. 1839G. Roberts Dict. Geol., Tripoli powder.., used for polishing fossils, &c. It is itself the remains of fossil insects. 1868Dana Min. (ed. 5) 199 Tripolite..(c) Tripoli slate (Polishing slate..), a slaty or thin laminated variety, fragile.
2. A large, mild onion; also, the plant producing a bulb of this kind. Also attrib.
1822J. C. Loudon Encycl. Gardening iii. i. 715 Tripoli, the largest onion grown; oval, light-red, tinged with green and brown, soft and mild. 1873Young Englishwoman Sept. 446/2 The best varieties [of onion] for autumn sowing are the Tripoli, Giant Madeira, [etc.]. 1932Times Educ. Suppl. 27 Feb. (Home & School Suppl.) p. iv/1 The following crops should be started as soon as possible:..tripoli onions, shallots, [etc.]. 1951Dict. Gardening (R. Hort. Soc.) III. 1425/2 Such onions as the Roccas, white Lisbon, and Tripoli..are of no value for storing.
Hence ˈtripolite Min., an infusorial variety of opalsilica, constituting one of the kinds of tripoli; ˈtripolith [Gr. λίθος stone], trade name for a kind of cement: see quot.
1868Dana Min. (ed. 5) 199 Infusorial Earth, or Earthy Tripolite, a very fine-grained earth looking often like an earthly chalk, or a clay. 1882Athenæum 30 Sept. 438/1 The new binding material ‘tripolith’,..is composed of sulphate of lime (gypsum), coke powder, and precipitated oxide of iron. |