| 单词 | protractor |
| 释义 | protractor /proh trak"teuhr, preuh-/, n. 1. a person or thing that protracts. 2. (in surveying, mathematics, etc.) an instrument having a graduated arc for plotting or measuring angles. 3. Anat. a muscle that causes a part to protrude. [1605-15; < ML; see PROTRACT, -TOR] |
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