boulder

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a large smooth mass of rock detached from its place of origin (Freq. 1)
• Syn:
bowlder
• Derivationally related forms:
bouldery
• Hypernyms:
rock, stone
• Hyponyms:
glacial boulder, river boulder, shore boulder
• Instance Hyponyms:
Plymouth Rock

• Từ đồng nghĩa / Synonyms:
  Boulder, bowlder