roar

American Heritage® Dictionary of the English Language, Fourth Edition

1. v. To utter a loud, deep, prolonged sound, especially in distress, rage, or excitement.
2. v. To laugh loudly or excitedly.
3. v. To make or produce a loud noise or din: The engines roared.
4. v. To be disorderly or rowdy.
5. v. To breathe with a rasping sound. Used of a horse.
6. v. To utter or express with a loud, deep, and prolonged sound. See Synonyms at shout.
7. v. To put, bring, or force into a specified state by roaring: The crowd roared itself hoarse.
8. n. A loud deep prolonged sound or cry, as of a person in distress or rage.
9. n. The loud deep cry of a wild animal.
10. n. A loud prolonged noise, such as that produced by waves.
11. n. A loud burst of laughter.
12. roar back To have great success after a period of lackluster performance; make a dramatic recovery: lost the first set but roared back to win the match.

Century Dictionary and Cyclopedia

1. To cry with a full, loud, continued sound; bellow, as a beast.
2. To cry aloud, as in distress or anger.
3. To make a loud, continued, confused sound, as winds, waves, a multitude of people shouting together, etc.; give out a full, deep sound; resound.
4. To laugh out loudly and continuously; guffaw.
5. To behave in a riotous and bullying manner.
6. To make a loud noise in breathing, as horses in a specific disease. See roaring, n., 2.
7. Synonyms and To bawl, howl, yell.
8. To boom, resound, thunder, peal.
9. To cry aloud; proclaim with loud noise; utter in a roar; shout: as, to roar out one's name.
10. n. A full, loud, and deep cry, as of the larger beasts.
11. n. A loud, continued, confused sound; a clamor; tumult; uproar.
12. n. The loud, impassioned cry of a person in distress, pain, anger, or the like; also, a boisterous outcry of joy or mirth: as, a roar of laughter.

Wiktionary

1. v. To make a loud, deep cry, especially from pain, anger, or other strong emotion.
2. v. To laugh in a particularly loud manner.
3. v. Of animals (especially the lion), to make a loud deep noise.
4. v. Generally, of inanimate objects etc., to make a loud resounding noise.
5. n. A long, loud, deep shout made with the mouth wide open.
6. n. The cry of the lion.
7. n. The deep cry of the bull.
8. n. A loud sound as of a motorbike or a similar engine.
9. n. A show of strength or character.

GNU Webster's 1913

1. v. To cry with a full, loud, continued sound.
2. v. To bellow, or utter a deep, loud cry, as a lion or other beast.
3. v. To cry loudly, as in pain, distress, or anger.
4. v. To make a loud, confused sound, as winds, waves, passing vehicles, a crowd of persons when shouting together, or the like.
5. v. To be boisterous; to be disorderly.
6. v. To laugh out loudly and continuously.
7. v. To make a loud noise in breathing, as horses having a certain disease. See Roaring, 2.
8. v. To cry aloud; to proclaim loudly.
9. n. The deep, loud cry of a wild beast.
10. n. The cry of one in pain, distress, anger, or the like.
11. n. A loud, continuous, and confused sound.
12. n. A boisterous outcry or shouting, as in mirth.

WordNet 3.0

1. v. make a loud noise, as of animal
2. v. laugh unrestrainedly and heartily
3. v. make a loud noise, as of wind, water, or vehicles
4. v. utter words loudly and forcefully
5. n. a deep prolonged loud noise
6. v. emit long loud cries
7. n. a very loud utterance (like the sound of an animal)
8. v. act or proceed in a riotous, turbulent, or disorderly way
9. n. the sound made by a lion