Definition of "tailcoat" []

• A man's black coat worn for formal daytime occasions and having a long rounded and split tail. Also called swallowtail, swallow-tailed coat. (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.

• "The infamous photo of Dave posing alongside his posho chums from the Bullingdon Club in an expensive royal blue tailcoat is one of the few clues we have."
• "His jackets echo the shape of a dandy tailcoat, and Mr. Miller's shirts have an unusual cutaway collar reminiscent of a bank teller in a Sergio Leone Western."
• "But for example, I have had a number of occasions to use my suits and ties, though my dinner jacket and tailcoat continue to collect dust."