| 释义 |
rootlet|ˈruːtlɪt|
[f. root n.1 + -let.]
1. A branch of the root of a plant; a subsidiary root; also, one of the secondary roots thrown out laterally for support by ivy and a few other climbing plants.
1793Martyn Lang. Bot. s.v., Root-leaf and Rootlet are more proper in English than Radical leaf and Radicle. 1827H. Steuart Planter's G. (1828) 237 Every effort must be made to preserve the minutest fibres and capillary rootlets entire. 1860Gosse Rom. Nat. Hist. 57 He tears up the reluctant tree, and..exposes the juicy and tender rootlets. 1888J. Inglis Tent Life in Tigerland 116 A fine old fig-tree, with numberless tendrils and rootlets hanging pendant.
fig.1878T. L. Cuyler Pointed P. 170 The soul thus reaches down through its every rootlet into Christ's deep, cool well.
b. Used collect. without article. rare—1.
1894Baring-Gould Deserts S. France I. 23 To combine with their delicate lacings of rootlet to keep the soil in place.
2. Malting. The radicle of a steeped grain. Also collect.
1830in M. Donovan Dom. Econ. I. 83 The moment the rootlet makes its appearance, the vegetation is stopped. 1860E. S. White Maltster's Guide 62 Floor charges occasionally arise from the rank growth of rootlet. Ibid. 92 It is necessary to separate the rootlets from the malt.
3. Physiol. A slender branch, fibre, etc., of some structure, such as a vein or nerve.
1875Encycl. Brit. I. 903/1 The veins corresponding to them are rootlets of the inferior vena cava. 1876J. S. Bristowe Th. & Pract. Med. (1878) 659 Membranous pellicles..prolonged by rootlets into the Lieberkühnian follicles. 1899Allbutt's Syst. Med. VI. 768 The rootlets of the third nerve pass archwise through the tegmentum cruris. |