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Webster 1913 Edition

Noun.

One who, or that which, roars.

Specifically:

(a)

A riotous fellow; a roaring boy.

A lady to turn

roarer

, and break glasses.

Massinger.

(b)

(Far.)

A horse subject to roaring. See

, 2.

(Zool.)

The barn owl.

[Prov. Eng.]

Noun.

One that roars, man or beast.

roarer ‎(plural roarers)

One who roars.
(archaic) One of a group of young men who would carouse in taverns, then pick brawls on the street for entertainment.