Definition of Boulder

a large rock typically made smooth by erosion

Examples of Boulder in a sentence

A large boulder fell from the cliffs above during the storm, blocking the road with its smooth surface.  🔊

The only difference in a rock and a boulder is how large it is, though most boulders tend to have a smoother surface.  🔊

I would not consider a rock to be a boulder unless it was larger than me, and I am roughly six feet tall.  🔊

If you want to find a boulder, the best place to go would be the Rocky Mountains, since large rocks are all around those formations.  🔊

A boulder does not necessarily have to be smooth, but most people view boulders as rocks that have been weathered smooth by erosion.  🔊

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