n. 1. A loud, deep, prolonged sound, as of a large beast, or of a person in distress, anger, mirth, etc., or of a noisy congregation. [ 1913 Webster ]

2. (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. [ 1913 Webster ]

(Naut.) The middle latitudes of the southern hemisphere. So called from the boisterous and prevailing westerly winds, which are especially strong in the South Indian Ocean up to 50° S. [ Webster 1913 Suppl. ]

adv. In a roaring manner. [ 1913 Webster ]

The decade from 1920 to 1929; -- so called because of the occurrence of a prosperous economy and rapid changes in sociological mores as exemplified by speakeasies, the popularity of fast cars and jazz, and the boisterous unconventional behavior of young adults in that period. See also flapper, speakeasy, and second prohibition. [ PJC ]