ball-and-socket joint

noun

ball-and-sock·​et joint ˈbȯl-ən(d)-ˈsä-kət- How to pronounce ball-and-socket joint (audio)
1
: a joint in which a ball moves within a socket so as to allow rotary motion in every direction within certain limits
2
: an articulation (such as the hip joint) in which the rounded head of one bone fits into a cuplike cavity of the other and admits movement in any direction

Illustration of ball-and-socket joint

Illustration of <span class=syl>ball<span class=sylbreak>-</span>and<span class=sylbreak>-</span>sock</span><span class=syl>et joint</span>
  • ball-and-socket joint 1

Examples of ball-and-socket joint in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Shepherds are prone to hip and elbow dysplasia, painful genetic diseases in which the ball-and-socket joints fit together poorly. Cody Cottier, Discover Magazine, 31 July 2023 The phone/camera mount features a ball-and-socket joint and the kit comes with the addition of a gooseneck mount for the ring light, making lighting and filming even the most intricate tabletop activities a breeze. Good Housekeeping, 8 Feb. 2023 The phone holder can be applied to the windshield or dashboard and features a telescopic arm with a pivoting ball-and-socket joint, allowing for a wide array of customization in terms of viewing angle. Nikolas Greenwald, Good Housekeeping, 10 Jan. 2023 Their wrist is made up of a ball-and-socket joint, much like our shoulders or hips. Discover Magazine, 17 Mar. 2011 At the end of each of the small primate’s hands are six fingers, including a long and adroit middle finger that can swivel in any direction due to its ball-and-socket joint, like a human shoulder, writes Defector’s Sabrina Imbler. Will Sullivan, Smithsonian Magazine, 31 Oct. 2022 The shoulder is a ball-and-socket joint that is mobile, but also unstable. Jen Murphy, WSJ, 15 Jan. 2022 The columns are substantial but are linked to the roof only with a daringly thin ball-and-socket joint. Anthony Paletta, WSJ, 14 Jan. 2022 The seven vertebrae in her neck—the same number as in a human’s—are connected by ball-and-socket joints like those in our shoulders, so instead of lifting up like a rigid beam, her neck snakes upward in an almost reptilian way. Ed Yong, The Atlantic, 13 Mar. 2020

Word History

First Known Use

1779, in the meaning defined at sense 1

Time Traveler
The first known use of ball-and-socket joint was in 1779

Dictionary Entries Near ball-and-socket joint

Cite this Entry

“Ball-and-socket joint.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ball-and-socket%20joint. Accessed 28 Nov. 2024.

Kids Definition

ball-and-socket joint

noun
: a joint (as in the hip) in which a rounded part moves within a socket so as to allow movements in many directions

Medical Definition

ball-and-socket joint

noun
: an articulation (as the hip joint) in which the rounded head of one bone fits into a cuplike cavity of the other and admits movement in any direction

called also enarthrosis

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