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adjective

1. Characterized by great celerity: breakneck, expeditious, fast, fleet, quick, speedy, swift. Informal hell-for-leather. Idioms: quick as abunnywink. See fast/slow/velocity.
2. Accomplished in very little time: brief, expeditious, fast, flying, hasty, hurried, quick, short, speedy, swift. See fast/slow/velocity.

Definition: very quick
Antonyms: languishing, leisurely, slack, slow

LearnThatWord.com is a free vocabulary and spelling program where you only pay for results!

• Active, Lively, Awake, or Limber

For other uses, see Rapid (disambiguation).

Rapids featuring whitewater, close to the Rhine Falls

Violent water below Niagara Falls

Rapids on the Mississippi River, Pakehnham, Ontario, Canada

A rapid is a section of a river where the river bed has a relatively steep gradient causing an increase in water velocity and turbulence. A rapid is a hydrological feature between a run (a smoothly flowing part of a stream) and a cascade. A rapid is characterised by the river becoming shallower and having some rocks exposed above the flow surface. As flowing water splashes over and around the rocks, air bubbles become mixed in with it and portions of the surface acquire a white colour, forming what is called "whitewater". Rapids occur where the bed material is highly resistant to the erosive power of the stream in comparison with the bed downstream of the rapids. Very young streams flowing across solid rock may be rapids for much of their length.

River Rapids

Rapids are categorized in classes, generally running from I to VI. A Class 5 rapid may be categorized as Class 5.1-5.9. While class I rapids are easy to negotiate and require no maneuvering, class VI rapids pose threat to life with little or no chance for rescue.

See also

• Fluid dynamics - for academic digestion.
• International Scale of River Difficulty - for classification of rapids.
• Rheophile - organisms that live in fast flowing water.
• Riffle - A fast moving portion of a stream without the vigour of a rapid
• Whitewater - for factors related to rapids.

References

• Mason, Bill (1984). Path of the Paddle. Northword Press. ISBN 9781559710046. 

External links

Media related to Rapids at Wikimedia Commons

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)

Dansk (Danish)
adj. - hurtig, stejl (skråning), følsom (film)
n. - vandfald, med stærk strøm

idioms:

• rapid eye-movement    REM (søvn)
• rapid transit    ekspres- (trafik)

Nederlands (Dutch)
snel, spoedig, scherp dalend (helling), (mv) stroomversnelling (meestal rotsachtig)

Français (French)
adj. - (gén) rapide
n. - les rapides

idioms:

• rapid eye movement    mouvement oculaire rapide
• rapid transit    (US, Transp) transport public

Deutsch (German)
adj. - schnell, rasch, rapide
n. - Blitzschnelle, Stromschnelle

idioms:

• rapid eye movement    REM (Augenbewegungen beim Schlafen)
• rapid transit    Schnellverkehr

Ελληνική (Greek)
adj. - γρήγορος, γοργός, ορμητικός, απότομος

idioms:

• rapid eye-movement    γρήγορη οφθαλμική κίνηση
• rapid transit    ταχείες αστικές συγκοινωνίες (υπόγειο, μετρό, υπερυψωμένος σιδηρόδρομος)

Italiano (Italian)
rapide, rapido

idioms:

• rapid eye-movement    rapido movimento oculare
• rapid transit    trasporto ad alta velocitý

Português (Portuguese)
adj. - rápido

idioms:

• rapid eye-movement    piscar de olhos
• rapid transit    trânsito veloz

Русский (Russian)
речной порог, быстрина, быстрый, скорый, крутой

idioms:

• rapid eye-movement    сон с быстрым движением глаз
• rapid transit    общественный транспорт

Español (Spanish)
adj. - rápido, muy empinado
n. - rápidos, rápido, muy empinado, rabión

idioms:

• rapid eye movement    movimiento rápido del ojo
• rapid transit    línea ferroviaria urbana, transporte público rápido

Svenska (Swedish)
adj. - hastig, strid

中文（简体）(Chinese (Simplified))
迅速的, 急促的, 飞快的, 急流, 高速交通网, 高速交通工具

idioms:

• rapid eye-movement    快速眼动
• rapid transit    高速交通系统, 都市捷运系统

中文（繁體）(Chinese (Traditional))
adj. - 迅速的, 急促的, 飛快的
n. - 急流, 高速交通網, 高速交通工具

idioms:

• rapid eye-movement    快速眼動
• rapid transit    高速交通系統, 都市捷運系統

한국어 (Korean)
adj. - 신속한, 날랜, 가파른
n. - 여울, 급류, 고속수송 열차

日本語 (Japanese)
adj. - 速い, 急な, 迅速な, すばやい, 敏捷な
n. - 早瀬, 高速輸送車

idioms:

• rapid eye-movement    急速眼球運動
• rapid transit    高速旅客輸送, 早指しチェス

العربيه (Arabic)
‏(صفه) سريع‏

עברית (Hebrew)
adj. - ‮מהיר, תלול‬
n. - ‮זרם נהר, אשד‬