roaring

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Very lively or successful; thriving: a roaring trade.
2. adj. Used as an intensive: roaring drunk.

Century Dictionary and Cyclopedia

1. n. A loud, deep cry, as of a lion; an outcry of distress, anger, applause, boisterous mirth, or the like; loud continued sound, as of the billows of the sea or of a tempest.
2. n. A disease of horses which causes them to make a singular noise in breathing under exertion; the act of making the noise so caused; also, this noise. The disease is due to paralysis and wasting of certain laryngeal muscles, usually of the left side; this results in a narrowing of the glottis, giving rise to an unnatural inspiratory sound, manifested chiefly under exertion.
3. Making or characterized by a noise or disturbance; disorderly; riotous.
4. Going briskly; highly successful.
5. A kind of humming-top.

Wiktionary

1. adj. Very; intensively; extremely.
2. adj. Very successful; lively; profitable; thriving; prosperous.
3. v. present participle of roar.
4. n. A loud, deep, prolonged sound, as of a large beast; a roar.
5. n. An affection of the windpipe of a horse, causing a loud, peculiar noise in breathing under exertion.

GNU Webster's 1913

1. n. A loud, deep, prolonged sound, as of a large beast, or of a person in distress, anger, mirth, etc., or of a noisy congregation.
2. n. (Far.) An affection of the windpipe of a horse, causing a loud, peculiar noise in breathing under exertion; the making of the noise so caused. See Roar, v. i., 5.

WordNet 3.0

1. adv. extremely.
2. n. a deep prolonged loud noise
3. adj. very lively and profitable
4. n. a very loud utterance (like the sound of an animal)