| 单词 |
sinusoid |
| 释义 |
sinusoid|ˈsaɪnəsɔɪd|
[a. F. sinusoïde, f. L. sinus sinus + -oid.]
1. Math. A curve of sines (curve n. 1).
1823Lardner Algebraic Geom. I. 200 A curve, represented by the equation y = sin. x, related to rectangular co-ordinates, is called the curve of sines, or the sinusoid. 1876Proc. Lond. Math. Soc. VII. 213 Prof. Cayley described a surface, depending upon the sinusoid, which was being constructed for him. 1884tr. Glaser de Cew's Magn. & Dynamo-electric Machines 254 If the magnetic field in which the armature rotated were uniform, this curve would be a true ‘sinusoid’, or curve of sines.
2. A blood vessel similar in size to a capillary but irregular in shape and without the continuous endothelial lining of capillaries.
1900Minot in Proc. Boston Nat. Hist. Soc. 185 The [blood-] vessels of the first type are true capillaries... The vessels of the second type I propose to name ‘sinusoids’, on account of their resemblance to true sinus and also to separate them clearly from genuine capillaries. 1920Nature 27 May 411/1 A system of wide sinusoids (renal venous meshwork), which has no connection with the intertubular plexus. 1974D. & M. Webster Compar. Vertebr. Morphol. xiii. 315 In the mammalian adrenal cortex the steroidogenic tissues can be divided into zones on the basis of the arrangement of cells and their relationships to the numerous blood sinusoids. |
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