Illustration of knuckle joint
knuckle joint
noun
: a hinge joint in which a projection with an eye on one piece enters a jaw between two corresponding projections with eyes on another piece and is retained by a pin or rivet
Examples of knuckle joint in a Sentence
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Our knuckle joints are composed of two bones capped with cartilage.
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Sarah Lindenfeld Hall, Popular Science, 7 Jan. 2026
Stretch both joints by holding the finger below the knuckle joint and bending both joints.
—Lana Barhum, Verywell Health, 14 Aug. 2024
All the fingers share one big pivot point at the palm of the hand, and there's a knuckle joint halfway up the finger.
—Ron Amadeo, Ars Technica, 6 Feb. 2024
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Sarah Lindenfeld Hall, Popular Science, 7 Jan. 2026
Stretch both joints by holding the finger below the knuckle joint and bending both joints.
—Lana Barhum, Verywell Health, 14 Aug. 2024
All the fingers share one big pivot point at the palm of the hand, and there's a knuckle joint halfway up the finger.
—Ron Amadeo, Ars Technica, 6 Feb. 2024
Cite this Entry
“Knuckle joint.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/knuckle%20joint. Accessed 15 Jan. 2026.
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