rectangular Syllabification: (rec·tan·gu·lar)Pronunciation: /rekˈtaNGgyələr/Translate rectangular | into French | into German | into Italian | into Spanish Definition of rectangular adjective 1denoting or shaped like a rectangle:a neat rectangular area (of a solid) having a base, section, or side shaped like a rectangle:a rectangular prism 2placed or having parts placed at right angles. Derivatives rectangularityPronunciation: /rekˌtaNGgyəˈlaritē/ noun rectangularly adverb rectangular in other Oxford dictionaries Definition of rectangular in the British & World English dictionary