I. ˈrȯr verb
Etymology: Middle English roren, from Old English rārian; akin to Old High German rērēn to bleat
Date: before 12th century
intransitive verb
1.
a. : to utter or emit a full loud prolonged sound
b. : to sing or shout with full force
2.
a. : to make or emit a loud confused sound (as background reverberation or rumbling)
b. : to laugh loudly
3.
a. : to be boisterous or disorderly
b. : to proceed or rush with great noise or commotion
4. : to make a loud noise during inhalation (as that of a horse affected with roaring)
transitive verb
1. : to utter or proclaim with a roar
2. : to cause to roar
II. noun
Date: 14th century
1. : the deep cry of a wild animal (as a lion)
2. : a loud deep cry (as of pain or anger)
3. : a loud continuous confused sound
the roar of the crowd
4. : a boisterous outcry