: a ring (as of synthetic rubber) used as a gasket
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The waist is adjustable for a custom fit, and there’s an O-ring for attaching keys, gloves or lift tickets.—Bestreviews, Chicago Tribune, 3 Mar. 2026 The motor is suspended by multiple O-rings to minimize vibration.—Robert Ross, Robb Report, 22 Feb. 2026 Extreme cold made the O-rings fail, but NASA’s culture was just as blameworthy and needed a retrofit more urgently than any piece of shuttle hardware.—Meghan Bartels, Scientific American, 28 Jan. 2026 In January 1986, cold temperatures compromised rubber O-ring seals on the solid rocket boosters of the space shuttle Challenger, which led to a tragic accident that claimed the lives of seven astronauts during the launch of the STS-51L mission.—Josh Dinner, Space.com, 27 Jan. 2026 See All Example Sentences for O-ring