Meaning & use
Boulder
Last updated
A large rock or mass of stone, typically rounded by weathering or erosion, lying on or partly buried in the ground.
See it in a sentence
Hikers rested on a huge boulder overlooking the valley.
A boulder had rolled onto the trail after the storm, blocking the path.
A note on using this word
Geologists classify a boulder as any rock fragment larger than 256 millimeters, or about 10 inches, in diameter.
Words with a similar meaning
rockstone
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
pebble
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