| xylophone | (noun) a percussion instrument with wooden bars tuned to produce a chromatic scale and with resonators; played with small mallets | Synonyms: marimba |
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| xylophonist | (noun) someone who plays a xylophone | - |
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| yottaflop | (noun) (computer science) a unit for measuring the speed of a computer system, equal to one septillion floating-point operations a second. | Synonyms: YFLOPS |
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| zettaflop | (noun) (computer science) a unit for measuring the speed of a computer system, equal to one sextillion floating-point operations a second. | Synonyms: ZFLOPS |
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