1. (

• boom ,
• roar ,
• roaring ,
• thunder

) a deep prolonged loud noise ;

2. (

• bellow ,
• bellowing ,
• holla ,
• holler ,
• hollering ,
• hollo ,
• holloa ,
• roar ,
• roaring ,
• yowl

) a very loud utterance (like the sound of an animal); "his bellow filled the hallway" ;

3. (

• roar ,

) the sound made by a lion ;

1. (

• roar ,
• howl ,

) make a loud noise, as of wind, water, or vehicles; "The wind was howling in the trees"; "The water roared down the chute" ;

2. (

• thunder ,
• roar ,

) utter words loudly and forcefully; "`Get out of here,' he roared" ;

3. (

• howl ,
• ululate ,
• wail ,
• roar ,
• yawl ,
• yaup

) emit long loud cries; "wail in self-pity"; "howl with sorrow" ;

4. (

• roar

) act or proceed in a riotous, turbulent, or disorderly way; "desperadoes from the hills regularly roared in to take over the town"-R.A.Billington ;

5. (

• bellow ,
• roar ,

) make a loud noise, as of animal; "The bull bellowed" ;

6. (

• roar ,
• howl

) laugh unrestrainedly and heartily ;