Definition of "watter"

The original cost of the 100-watter is approximately 15 cents, while the 2 60-watters will cost about 26 cents, and the 6 25-watters will cost about 60 cents. That’s one saving. To operate the 100-watter for 1,000 hours in a community where electricity costs 4 cents a kilowatt hour would cost $4.00. The cost of operating the 2 60-watters would be $5.00, while the cost of operating the 6 25-watters would be $6.00.

1940 November 15, Consumers’ Guide, volume VII, number 4, page 13, column 3

The small, mushroom-shaped bulb is a new 300-watter recently put on the market by Westinghouse for about $1.25.

1950 October, Popular Science, page 225, column 2

In 1927 Bridge built station KTAP, another 10-watter on 1140 kilocycles.

1998, Morton Richard Schroeder, Texas Signs On: The Early Days of Radio and Television, Texas A&M University Press, page 47

Malcolm’s tighter, punchier rhythm tone is consistent with the use of any of these big 100-watters (a Marshall Super Bass would be particularly bold in this department), and this was clearly another key ingredient—partnered with his Filter’Tron-loaded Gretsch—in the unparalleled chunk of the AC/DC rhythm assault. While Angus also often records through the 100-watters, he has been known to use any of a range of several JTM45s, a JTM50, and a later JMP50 in the studio (the former with KT66s, the latter two amps with EL34s).

2010, Phil Sutcliffe, AC/DC: High-Voltage Rock ’n’ Roll: The Ultimate Illustrated History, Voyageur Press, published 2011, page 23, column 1