[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]

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
Once there is contact, pull your head back and roar in mock rage.
The dinosaurs roar and come with descriptive information, and new dinosaurs
  will be added in future updates.
The roar of the chopper blasts through my headphones.
It was clapping, stamping and swooshing with a roar.
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