Definition of "onion dome" [on•ion dome]

• A pointed bulbous domelike roof, used especially in parts of Russia and eastern Europe. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "There are companies in Portugal that make beautiful copper stills, hand-hammered pieces of sculpture like the onion dome on an Orthodox church."