Longman Dictionary of Contemporary English homepage

parallelogram

 noun
     
Related topics: Shapes, Patterns, Maths
par‧al‧lel‧o‧gram [countable]
HMCF a flat shape with four sides in which each side is the same length as the side opposite it and parallel to it [↪ rectangle]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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