Roller-bearing
noun, Machinery.
1.
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.
roller bearing
noun
1.
a bearing in which a shaft runs on a number of hardened-steel rollers held within a cage
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- Roller-blind shutter
[roh-ler-blahynd] /ˈroʊ lərˌblaɪnd/ noun, Photography. 1. curtain shutter.
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noun 1. (television) caption lettering that moves progressively up or across the picture, as for showing the credits at the end of a programme Often shortened to roller
- Roller-chain
noun 1. a power chain consisting of parallel pairs of flat links joined by pins covered with rollers, and engaging with the teeth of sprockets. roller chain noun 1. (engineering) a chain for transmitting power in which each link consists of two free-moving rollers held in position by pins connected to sideplates
- Rollercoaster
[roh-ler-koh-ster, roh-li-] /ˈroʊ lərˌkoʊ stər, ˈroʊ lɪ-/ verb (used without object) 1. to go up and down like a roller coaster; rise and fall: a narrow road roller-coastering around the mountain; a light boat roller-coastering over the waves. 2. to experience a period of prosperity, happiness, security, or the like, followed by a contrasting period […]