Princeton's WordNet

1. boom, roar, roaring, thunder(noun)

   a deep prolonged loud noise

2. bellow, bellowing, holla, holler, hollering, hollo, holloa, roar, roaring, yowl(noun)

   a very loud utterance (like the sound of an animal)

   "his bellow filled the hallway"

3. roar(verb)

   the sound made by a lion

4. roar, howl(verb)

   make a loud noise, as of wind, water, or vehicles

   "The wind was howling in the trees"; "The water roared down the chute"

5. thunder, roar(verb)

   utter words loudly and forcefully

   "`Get out of here,' he roared"

6. howl, ululate, wail, roar, yawl, yaup(verb)

   emit long loud cries

   "wail in self-pity"; "howl with sorrow"

7. roar(verb)

   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

8. bellow, roar(verb)

   make a loud noise, as of animal

   "The bull bellowed"

9. roar, howl(verb)

   laugh unrestrainedly and heartily

Kernerman English Learner's Dictionary

1. roar(verb)ɔr, roʊr

   to make a very loud continuous noise

   The plane's engines roared.

2. roarɔr, roʊr

   (of a lion) to make a loud sound

   The male roared loudly.

3. roarɔr, roʊr

   to laugh or shout very loudly

   My uncle roared with laughter at my joke.; The crowd roared its approval.

4. roarɔr, roʊr

   (of a vehicle) to move somewhere making a loud noise

   A motorcycle roared down the road.

5. roar(noun)ɔr, roʊr

   a loud continuous noise

   the roar of the crowd/traffic

6. roarɔr, roʊr

   the noise a lion makes

   He gave a loud roar.

Wiktionary

1. roar(Noun)

   A long, loud, deep shout made with the mouth wide open.

2. roar(Noun)

   The cry of the lion.

3. roar(Noun)

   The deep cry of the bull.

4. roar(Noun)

   A loud sound as of a motorbike or a similar engine.

5. roar(Noun)

   A show of strength or character.

6. roar(Verb)

   To make a loud, deep cry, especially from pain, anger, or other strong emotion.

7. roar(Verb)

   To laugh in a particularly loud manner.

8. roar(Verb)

   Of animals (especially the lion), to make a loud deep noise.

   The lioness roared to scare off the hyenas.

9. roar(Verb)

   Generally, of inanimate objects etc., to make a loud resounding noise.

Origin: rarian, from . Cognate with röhren.

Webster Dictionary

1. Roar(verb)

   to cry with a full, loud, continued sound

2. Roar(verb)

   to bellow, or utter a deep, loud cry, as a lion or other beast

3. Roar(verb)

   to cry loudly, as in pain, distress, or anger

4. Roar(verb)

   to make a loud, confused sound, as winds, waves, passing vehicles, a crowd of persons when shouting together, or the like

5. Roar(verb)

   to be boisterous; to be disorderly

6. Roar(verb)

   to laugh out loudly and continuously; as, the hearers roared at his jokes

7. Roar(verb)

   to make a loud noise in breathing, as horses having a certain disease. See Roaring, 2

8. Roar(verb)

   to cry aloud; to proclaim loudly

9. Roar(noun)

   the sound of roaring

10. Roar(noun)

    the deep, loud cry of a wild beast; as, the roar of a lion

11. Roar(noun)

    the cry of one in pain, distress, anger, or the like

12. Roar(noun)

    a loud, continuous, and confused sound; as, the roar of a cannon, of the wind, or the waves; the roar of ocean

13. Roar(noun)

    a boisterous outcry or shouting, as in mirth

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