| 单词 | jack timber |
| 释义 | > as lemmasjack timber jack timber n. Architecture and Building. any timber which is shorter than others in the same structure, esp. one which is intersected by another timber.Chiefly (and now only) in glossaries. ΚΠ 1819 P. Nicholson Archit. Dict. II. 149/1 Jack Timber, any timber that is interrupted in its whole length, or cut short. 1908 Cycl. Archit., Carpentry & Building II. 359 The square is placed on the jack timber rafter. 1998 C. M. Harris Amer. Archit. 188/1 Jack timber, any timber in a framework which, being intercepted by some other piece, is shorter than the rest. < as lemmas |
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