roller ball
21Roller derby — For the skate brand of the same name, see Roller Derby (brand). Roller derby Charm City Roller Girls (Baltimore, Maryland). Characteristics Contact Collision C …
22roller bearing — Mach. a bearing consisting of cylindrical or tapered rollers running between races in two concentric rings, one of which is mounted on a rotating or oscillating part, as a shaft. [1855 60] * * * One of the two types of rolling, or antifriction,… …
23Roller in line hockey en France — Le roller in line hockey (RILH) en France. Sommaire 1 Organisation 1.1 Compétitions nationales 1.2 Compétitions internationales 2 Histoi …
24roller-skating — Recreation and sport in which the participants use roller skates (shoes with sets of wheels attached) to move about on special rinks or paved surfaces. The invention of roller skates is traditionally credited to the Belgian Joseph Merlin in the… …
25Ball bearing — For individual balls that are sometimes called ball bearings , see Ball (bearing). Working principle for a ball bearing …
26Roller — Tretroller * * * Rol|ler [ rɔlɐ], der; s, : Fahrzeug, das aus einem Brett mit zwei Rädern und einer Lenkstange besteht und mit einem Bein entweder durch Abstoßen am Boden oder durch einen Fußhebel vorwärtsbewegt wird: Roller fahren. * * *… …
27roller coaster — 1. a small gravity railroad, esp. in an amusement park, having a train with open cars that moves along a high, sharply winding trestle built with steep inclines that produce sudden, speedy plunges for thrill seeking passengers. 2. a car or train… …
28Roller — Der Begriff Roller bezeichnet: einen Motorroller (einspurigen Motorscooter) oder Kabinenroller ein unmotorisiertes (Kinder )Fahrzeug, siehe auch Tretroller einen Möbeldiscounter Roller (Möbelhaus) mehrere Arten von Schleichkatzen, beispielsweise… …
29roller — n. 1 a a hard revolving cylinder for smoothing the ground, spreading ink or paint, crushing or stamping, rolling up cloth on, hanging a towel on, etc., used alone or as a rotating part of a machine. b a cylinder for diminishing friction when… …
30roller — [1] A device for replacing sliding friction with rolling friction. [2] While ball bearings use a series of balls in a cage, roller bearings use a series of small cylinders. [3] A colloquial term for a Rolls Royce. See cam roller double roller… …
