a slender bar of magnetized iron, steel, etc that when freely suspended indicates the direction of a magnetic field in which it is placed, and that is the essential part of a magnetic compass
| 单词 | magnetic needle |
| 释义 | magnetic needlenouna slender bar of magnetized iron, steel, etc that when freely suspended indicates the direction of a magnetic field in which it is placed, and that is the essential part of a magnetic compass |
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