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polar front
polar nucleus
polar star
polar wandering
polarimeter
Polaris
polariscope
polarise
polarity
polarity therapy
polarize
polarizing microscope
polarography
Polaroid
polder
Pole
pole (1)
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polar axis
po·lar ax·is (plural po·lar ax·es)


noun 
Definition:
 
fixed reference line: the fixed horizontal line in a system of polar coordinates from which the angle made by the radius vector is measured
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