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Demicircle

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Demicircle \Dem"i*cir`cle\, n. [Cf. F. demi-cercle.]
   An instrument for measuring angles, in surveying, etc. It
   resembles a protractor, but has an alidade, sights, and a
   compass.
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