In canoe design, the curve of the keel line from bow to stern A straight keel line has no rocker, tracking well but lacking maneuverability A heavy rocker is exceptionally maneuverable but will not track well Moderately rockered canoes are usually straight with a rise toward the ends Most general recreation canoes have a moderate rocker
A measure of the amount of a curve in the portion of a skate blade that touches the ice Speed skating blades have little rocker, which makes them faster but less maneuverable Hockey skates have a great deal of rocker, allowing greater maneuverability
The amount of curvature in a wakeboard If a wakeboard has 2 inches of Rocker, then the tip and tail are 2 inches higher than the middle of the board There are two types of rocker, continuous and three-stage Continuous rocker is a smooth curve, while a board with three-stages of rocker, with a flat spot in the middle of the board
A multi-toothed steel tool for laying mezzotint ground It is rocked across the plate many times in all directions to produce the characteristic burr top
upward curvature of the keel of a boat toward bow and stern when viewed in profile On a flat surface, the bow and stern of a boat with rocker will not be resting on the surface, and the boat can "rock" (pitch) like a rocking chair On a boat with no rocker, a side view of the keel forms a perfectly straight line
a curved support that permits the supported object to rock to and fro an ice skate with a curved blade a trough on rockers used by gold miners to shake earth in water in order to separate the gold a teenager or young adult in the 1960s who wore leather jackets and rode motorcycles a performer or composer or fan of rock music an attendant who rocks a child in a cradle