[rawr-ing, rohr-]
the act of a person, animal, or thing that roars.
a loud, deep cry or sound or a series of such sounds.
Veterinary Pathology. a disease of horses, caused by respiratory obstruction or vocal cord paralysis, and characterized by loud or rough breathing sounds.
making or causing a roar, as an animal or thunder.
brisk or highly successful, as trade: He did a roaring business selling watches to tourists.
characterized by noisy, disorderly behavior; boisterous; riotous: roaring revelry.
complete; utter; out-and-out: a roaring idiot; a roaring success.
very; extremely: roaring drunk.

before 1000; Middle English roryng (noun, adj.), Old English rarung (noun). See roar, -ing1, -ing2

roaringly, adverb Unabridged


[rawr, rohr]
verb (used without object)
to utter a loud, deep cry or howl, as in excitement, distress, or anger.
to laugh loudly or boisterously: to roar at a joke.
to make a loud sound or din, as thunder, cannon, waves, or wind.
to function or move with a loud, deep sound, as a vehicle: The automobile roared away.
to make a loud noise in breathing, as a horse.
verb (used with object)
to utter or express in a roar: to roar denials.
to bring, put, make, etc., by roaring: to roar oneself hoarse.
a loud, deep cry or howl, as of an animal or a person: the roar of a lion.
a loud, confused, constant noise or sound; din; clamor: the roar of the surf; the roar of lively conversation from the crowded party.
a loud outburst: a roar of laughter; a roar of approval from the audience.

before 900; Middle English roren (v.), Old English rārian; cognate with Old High German rēren to bellow

roarer, noun
outroar, verb (used with object)
underroarer, noun

1. bawl, yell. See cry. 3. resound, boom, thunder, peal. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
roar (rɔː)
1.  (of lions and other animals) to utter characteristic loud growling cries
2.  (also tr) (of people) to utter (something) with a loud deep cry, as in anger or triumph
3.  to laugh in a loud hearty unrestrained manner
4.  See roaring (of horses) to breathe with laboured rasping sounds
5.  (of the wind, waves, etc) to blow or break loudly and violently, as during a storm
6.  (of a fire) to burn fiercely with a roaring sound
7.  (of a machine, gun, etc) to operate or move with a loud harsh noise
8.  (tr) to bring (oneself) into a certain condition by roaring: to roar oneself hoarse
9.  a loud deep cry, uttered by a person or crowd, esp in anger or triumph
10.  a prolonged loud cry of certain animals, esp lions
11.  any similar noise made by a fire, the wind, waves, artillery, an engine, etc
12.  a loud unrestrained burst of laughter
[Old English rārian; related to Old High German rērēn, Middle Dutch reren]

roaring (ˈrɔːrɪŋ)
1.  informal very brisk and profitable (esp in the phrase a roaring trade)
2.  (Austral) the roaring days the period of the Australian goldrushes
3.  derogatory, informal (Irish) (intensifier): a roaring communist
4.  noisily or boisterously (esp in the phrase roaring drunk)
5.  a loud prolonged cry
6.  Compare whistling a debilitating breathing defect of horses characterized by rasping sounds with each breath: caused by inflammation of the respiratory tract or obstruction of the larynx

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. rarian, probably of imitative origin (cf. M.Du. reeren, Ger. röhren "to roar;" Skt. ragati "barks;" Lith. reju "to scold;" O.C.S. revo "I roar;" L. raucus "hoarse"). The noun is attested from late 14c. Roaring forties in reference to exceptional rough seas between latitudes 40 and 50 south,
is attested from 1867.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
During the hot days of summer, the hives are fairly roaring with industry.
Therefore, silica aerogel can protect a human hand from the direct heat of a
  blowtorch as well as dampen its roaring sound.
Concerts often lasted for hours, but they included encores to appease the
  roaring applause.
Soon the mountains would be whitened with the snows of winter and every rivulet
  swollen to a roaring torrent.
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