rocker

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rocker

1. any of various devices that transmit or operate with a rocking motion
2. a steel tool with a curved toothed cage, used to roughen the copper plate in engraving a mezzotint
3. 
a. an ice skate with a curved blade
b. the curve itself
4. Skating
a. a figure consisting of three interconnecting circles
b. a half turn in which the skater turns through 180?, so facing about while continuing to move in the same direction

rocker

[′räk·ər]
(civil engineering)
A support at the end of a truss or girder which permits rotation and horizontal movement to allow for expansion and contraction.
(graphic arts)
A type of chisel, with a sharp beveled edge, used in mezzotint engraving; it is set on the surface of a copper plate and rocked back and forth to produce a rough grain, which, when printed, produces a velvety black.
(mining engineering)
A small digging bucket mounted on two rocker arms in which auriferous alluvial sands are agitated by oscillation, in water, to collect gold.
(ordnance)
Movable, built-in support in a field gun carriage, between the trail and the cradle, that allows changes in elevation to be made without disturbing the angle of position setting.
References in periodicals archive ?
The duo will have to see off rockers MGMT to take home the pize.
On "The Nothing Maker," Hynde swears off rockers, as well as actors, directors, fashion designers, painters, poets and photographers.
The 6ft 4ins tall 34-year-old saw off rockers Kaiser Chiefs and global superstars Coldplay to triumph on Tuesday night.