A large rounded mass of rock lying on the surface of the ground or embedded in the soil.(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 "boulder" in a sentence
"After the boulder is a immediate hard right switchback."
"It would be unsurprising to hear someone remark that the boulder is at the mercy of the elements, although we're more apt to say that it is the river that is at the mercy of this artifact, under the weight of human agency, and of Nash's relentless gaze and choreographic machinations."
"And roll over me a red boulder from the ruins of the Big House."