A person who is in charge of the performances in a circus ring.(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.
Use "ringmaster" in a sentence
"Come to think of it, as I recall the last time I managed to leave town without husband, kids, pets or job, pandemonium broke out under the Big Top and the ringmaster was there too."
"Immediately following the closing, the managing director of the circus (he also functioned as what in America would be called a ringmaster) assembled all performers."
""All ready!" called the ringmaster, holding his revolver high in the air again."