The forerunner of the dumbbell, halteres, were used in ancient Greece as lifting weights and also as weights in the ancient Greek version of the long jump. A kind of dumbbell was also used in India for more than a millennium, shaped like a club – so named Indian club. The design of the "Nal", as the equipment was referred to, can be seen as a halfway point between a barbell and a dumbbell. It was generally used in pairs, in workouts by wrestlers, bodybuilders, sports players, and others wishing to increase strength and muscle size.
"Dumbbells" as a word originated in Tudor England – referring to equipment simulating the action of a bell rope for the purpose of developing technique, and especially strength, for the purpose of practicing English bellringing (see Change Ringing), but without making a noise (hence dumb). When strongmen started to make their own equipment, they kept the name, even though the shape and form changed. See Oxford dictionary definition.
By the early 17th century, the familiar shape of the dumbbell, with two equal weights attached to a handle, had appeared. There are currently three main types of dumbbell:
- Adjustable dumbbells consist of a metal bar whose centre portion is often engraved with a crosshatch pattern (knurling) to improve grip. Weight disks (plates) are slid onto the outer portions of the dumbbell and secured with clips or collars. Shown to the right is a "spinlock" dumbbell, whose ends are threaded to accept large nuts as collars. Alternatively, a dumbbell may have smooth ends with plates being secured by a sprung collar. Nowadays, many commercially sold dumbbells are available with sophisticated, and easy-to-use methods for weight increments adjustments. This is meant to afford ease of use, thus preventing the need to stop workouts in order to raise or lower the weights.
- Fixed-weight dumbbells are weights created in a dumbbell shape. Inexpensive varieties consist of cast iron, sometimes coated with rubber or neoprene for comfort, and even cheaper versions consist of a rigid plastic shell that is filled with concrete.
- "Selectorized" dumbbells are adjustable dumbbells whose number of plates (i.e. weight) can be easily changed when it's resting in its stands. This is achieved by adjusting the number of plates that follow the handle when lifted, e.g. by turning a dial or moving a selector pin — rather than manually adding or removing plates. This makes it very easy to change the weight of the dumbbell between exercises, and the stand typically doubles as storage for the additional weights not being used for a particular exercise.
Jan Todd, From Milo to Milo, A History of Barbells, Dumbbells and Indian Clubs, Iron Game History, vol 3 No. 6, 1995, viewed at: 
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Look at other dictionaries:
dumbbell — dumb bell , dumb bell dumb bell , n. An exercising weight, consisting of two spheres or spheroids, connected by a short bar for a handle; used (often in pairs) for gymnastic exercise. [1913 Webster] 2. an ignorant or foolish person. Syn: dummy,… … The Collaborative International Dictionary of English
dumbbell — weighted bar used for exercise, 1711, originally an apparatus like that used to ring a church bell, but without the bell; used for exercise but sometimes also to practice ringing changes. Figurative sense of blockhead, stupid person attested by… … Etymology dictionary
dumbbell — [n] stupid person dodo*, dolt, dullard, dumbo*, dumdum*, dummy, dunce, idiot, ignoramus, moron, simpleton; concepts 412,423 Ant. brain, genius … New thesaurus
dumbbell — [dum′bel΄] n. [ DUMB + BELL1: from orig. shape] 1. a device usually used in pairs, consisting of round weights joined by a short bar, by which it is lifted or swung about in the hand for muscular exercise ☆ 2. [cf. DUMB, sense 7] Slang a stupid… … English World dictionary
Dumbbell — Nébuleuse de l Haltère Pour les articles homonymes, voir M27. Nébuleuse de l Haltère … Wikipédia en Français
dumbbell — UK [ˈdʌmˌbel] / US noun [countable] Word forms dumbbell : singular dumbbell plural dumbbells 1) a short metal bar with a weight at both ends that people lift in order to develop their muscles 2) American informal a stupid person … English dictionary
dumbbell — n. a stupid oaf. (Also a rude term of address.) □ Look, dumbbell, pay attention! □ I’m afraid I come on like a dumbbell sometimes … Dictionary of American slang and colloquial expressions
Dumbbell — An investment strategy, used mainly for bonds, where holdings are heavily concentrated in both very short and long term maturities. This is also known as a barbell, charting on a timeline gives the appearance of a barbell or dumbbell … Investment dictionary
dumbbell — one who does not think, an airhead, knucklehead What a dumbbell I am! I locked the keys in the car … English idioms
dumbbell — noun Date: 1785 1. a short bar with weights at each end that is used usually in pairs for exercise 2. a stupid person ; dummy … New Collegiate Dictionary