In a filar micrometer: (originally) any of several lengths of spider silk used to measure distances or mark the position of an object being…
| 单词 | θ215442 |
| 释义 | society > occupation and work > materials > raw material > other animal raw materials > [noun] > cobweb (4) web1746 In a filar micrometer: (originally) any of several lengths of spider silk used to measure distances or mark the position of an object being… spider-line1829 One of the threads or filaments of spider-web used to form the reticle of various optical instruments, esp. of micrometers, and serving to obtain… cobweb1837 A single thread spun by a spider. (Used in optical instruments.) cross-wire1866 a wire that crosses; spec. = cross-hair n. |
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