pyramide

• pyr‧a‧mid [countable]
• 1 a large stone building with four triangular (=three-sided) walls that slope in to a point at the top, especially in Egypt and Central America
• 2 [usually singular] a system, society, company etc that is organized in different levels, so that there is a small number of people at the top and a much larger number of people at the bottom:
• different levels of the management pyramid
• At the bottom of the pyramid are the poor.
• 3 a pile of objects that have been put into the shape of a pyramid
• pyramid of
• a pyramid of oranges
• 4 an object shaped like a pyramid
• —pyramidal adjective

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.