Definition of pyramidion in English:

pyramidion

noun

  • Chiefly Architecture and Archaeology. A small pyramid; especially (a) the pyramidal apex of an obelisk; (b) the capstone of a pyramid.

Origin

Mid 18th century; earliest use found in Thomas Shaw (1694–1751), traveller. From ancient Greek πυραμίδ-, πυραμίς pyramid + -ιον, diminutive suffix.

Pronunciation

pyramidion

/ˌpɪrəˈmɪdɪən/