(المسطرة) مَا يسطربه الْكتاب و (فِي الرياضة والهندسة) آلَة ذَات حافة مُسْتَقِيمَة قد تدرج وتستخدم لرسم المستقيمات أَو لقياس أطوالها (مج) والمسطرة الحاسبة آلَة ذَات مقاييس مدرجة على صفة خَاصَّة تسْتَعْمل لاستخراج نتائج العمليات الحسابية وقيم بعض الْمَقَادِير الرياضية (مج)(ج) مساطر
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