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Webster 1913 Edition

Noun.

A loud, deep, prolonged sound, as of a large beast, or of a person in distress, anger, mirth, etc., or of a noisy congregation.

(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

Verb.

, 5.

ppr.

Crying like a bull or lion; uttering a deep loud sound.

Noun.

The cry of a lion or other beast; outcry of distress, Job 3; loud continued sound of the billows of the sea or of a tempest. Is. 5.

roaring

Very; intensively; extremely.
- 1922, Ben Travers, chapter 1, in A Cuckoo in the Nest:
  “[…] the awfully hearty sort of Christmas cards that people do send to other people that they don't know at all well. You know. The kind that have mottoes like
  Here's rattling good luck and roaring good cheer, / With lashings of food and great hogsheads of beer. […]”
Very successful; lively; profitable; thriving; prosperous.

roaring

roaring ‎(plural roarings)

A loud, deep, prolonged sound, as of a large beast; a roar.
An affection of the windpipe of a horse, causing a loud, peculiar noise in breathing under exertion.