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Definition of parallel ruler noun from the Oxford Advanced Learner's Dictionary

parallel ruler

noun
 
/ˌpærəlel ˈruːlə(r)/
 
/ˌpærəlel ˈruːlər/
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  1. a device for drawing lines that are always the same distance apart, consisting of two connected rulers
See parallel ruler in the Oxford Advanced American Dictionary
swamp
noun
 
 
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Geography
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