tendon

American  

[ten-duhn] / ˈtɛn dən /

noun

1. Anatomy. a cord or band of dense, tough, inelastic, white, fibrous tissue, serving to connect a muscle with a bone or part; sinew.

2. a reinforcing strand in prestressed concrete.

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tendon British  

/ ˈtɛndən /

noun

1. a cord or band of white inelastic collagenous tissue that attaches a muscle to a bone or some other part; sinew

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tendon Scientific  

/ tĕn′dən /

1. A band of tough, fibrous, inelastic tissue that connects a muscle to a bone. Tendons are made chiefly of collagen.

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tendon Cultural  

1. A tough band of fibrous connective tissue that connects muscles to bones.

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Etymology

Origin of tendon

1535–45; < Medieval Latin tendōn- (stem of tendō ) < Greek ténōn sinew (spelling with -d- by association with Latin tendere to stretch)

Compare meaning

How does tendon compare to similar and commonly confused words? Explore the most common comparisons:

• aponeurosis vs. tendon
• tendon vs. ligament

Explanation

If you feel the back of your ankle, you will find the tough, ropelike tendon that joins your calf muscle to your heel bone. That's the job of tendons throughout your body: connecting bone and muscle so you can move. Consider that the Latin word tendere means "to stretch." That's an apt beginning for the word tendon, a tough but stretchy fibrous tissue (sinew). A tendon is made of dense bundles of fibrous collagen that form ropelike connectors that allow muscles and bones to work together. Athletes often suffer injuries to tendons, most often to the rotator cuff in the shoulder, the Achilles tendon in the leg, the patellar tendon in the knee, and the biceps muscle in the arm.

Example Sentences

Woods has been recovering from rupturing an Achilles tendon in March 2025 and back surgery in October.

From BBC • Mar. 31, 2026

Just three years ago, the Mets lost closer Edwin Díaz for the entire 2023 campaign after he tore a tendon in his knee celebrating a Puerto Rico victory in the same tournament.

From The Wall Street Journal • Mar. 17, 2026

When they close, they actually lock in place, thanks to a series of tendon notches that allow them to ratchet their grip tighter and tighter.

From Slate • Feb. 21, 2026

The veteran superstar had a back operation in September 2024 and was rehabilitating from that setback when he announced in March of 2025 that he had suffered a ruptured Achilles tendon.

From Barron's • Feb. 17, 2026

The tendon of his jaw was working, so I knew he was preparing a revelation.

From "The Poisonwood Bible" by Barbara Kingsolver

Related Words

• hamstring
• ligament
• sinew
• tissue