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单词 protractor
释义

WordReference Random House Learner's Dictionary of American English © 2024
pro•trac•tor /proʊˈtræktɚ, prə-/USA pronunciation   n. [countable]
  1. Mathematics, Surveyingan instrument used for measuring or drawing angles.
See -trac-.
WordReference Random House Unabridged Dictionary of American English © 2024
pro•trac•tor  (prō trak′tər, prə-),USA pronunciation n. 
  1. a person or thing that protracts.
  2. Mathematics, Surveying(in surveying, mathematics, etc.) an instrument having a graduated arc for plotting or measuring angles.
  3. Anatomya muscle that causes a part to protrude.
  • Medieval Latin; see protract, -tor
  • 1605–15

Collins Concise English Dictionary © HarperCollins Publishers::
protractor /prəˈtræktə/ n
  1. an instrument for measuring or drawing angles on paper, usually a flat semicircular transparent plastic sheet graduated in degrees
  2. a former term for extensor
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更新时间：2025/7/3 7:46:50