from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Either of two baryons that contain two strange quarks and have a neutral or negative charge, masses of 2,573 and 2,586 times that of the electron, and mean lifetimes of 2.9 × 10−10 and 1.6 × 10−10 second, respectively.
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- noun physics A
subatomic hadron particle, denoted by Ξ, comprising three quarks: one up or down quark, and two heavier quarks.
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Named after the Greek letter.
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