rocker

• POS: Noun
• HYPHEN: rock=er

CIDE DICTIONARY

rocker, n. 

•  One who rocks; specifically, one who rocks a cradle.  [1913 Webster]

  "It was I, sir, said the rocker, who had the honor, some thirty years since, to attend on your highness in your infancy."  [1913 Webster]
•  One of the curving pieces of wood or metal on which a cradle, chair, etc., rocks.  [1913 Webster]
•  Any implement or machine working with a rocking motion, as a trough mounted on rockers for separating gold dust from gravel, etc., by agitation in water.  [1913 Webster]
•  A play horse on rockers; a rocking-horse.  [1913 Webster]
•  A chair mounted on rockers; a rocking-chair.  [1913 Webster]
•  A skate with a curved blade, somewhat resembling in shape the rocker of a cradle.  [1913 Webster]
•  Same as Rock shaft.  [1913 Webster]

Rocker arm (Mach.), an arm borne by a rock shaft.

OXFORD DICTIONARY

rocker, n.
1 a person or thing that rocks.
2 a curved bar or similar support, on which something can rock.
3 a rocking-chair.
4 Brit. a young devotee of rock music, characteristically associated with leather clothing and motor cycles.
5 a skate with a highly curved blade.
6 a switch constructed on a pivot mechanism operating between the 'on' and 'off' positions.
7 any rocking device forming part of a mechanism.

Idiom

off one's rocker sl. crazy.

THESAURUS

rocker

burin, clarifier, colander, cradle, cribble, die, engraving tool, etching ball, etching ground, etching needle, etching point, filter, graver, intaglio, lixiviator, metronome, needle, oscillator, pendulum, percolator, point, punch, purifier, refiner, refinery, riddle, rocking chair, rocking stone, scorper, screen, seal, seesaw, shuttle, shuttlecock, sieve, sifter, stamp, strainer, style, swing, teeter, teeter-totter, teeterboard, teetery-bender, vibrator, winnow, winnowing basket, winnowing fan, winnowing machine