Synonym: boom, clamor, thunder. Similar words: uproar, roaring, uproarious, soar, board, coarse, aboard, on board. Meaning: [rɔr /rɔː] 
n. 1. a deep prolonged loud noise 2. a very loud utterance (like the sound of an animal) 3. the sound made by a lion. v. 1. make a loud noise, as of wind, water, or vehicles 2. utter words loudly and forcefully 3. emit long loud cries 4. act or proceed in a riotous, turbulent, or disorderly way 5. make a loud noise, as of animal 6. laugh unrestrainedly and heartily.
n. 1. a deep prolonged loud noise 2. a very loud utterance (like the sound of an animal) 3. the sound made by a lion. v. 1. make a loud noise, as of wind, water, or vehicles 2. utter words loudly and forcefully 3. emit long loud cries 4. act or proceed in a riotous, turbulent, or disorderly way 5. make a loud noise, as of animal 6. laugh unrestrainedly and heartily. 
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151. This extraordinary assertion was greeted with a roar of merriment.