Browse our free online reference library:

• X-Xz

• "X" Article - Dictionary of American History
• "X" as a Signature - West's Encyclopedia of American Law
• Villaurrutia, Xavier - The Columbia Encyclopedia, 6th ed.
• X Prize - Space Sciences
• X Prize Foundation - The Columbia Encyclopedia, 6th ed.
• X Rating - West's Encyclopedia of American Law
• x ref. - The Oxford Dictionary of Abbreviations
• X Terminal - A Dictionary of Computing
• X user interface - A Dictionary of Computing
• X Windows - A Dictionary of Computing
• Xánthi - The Columbia Encyclopedia, 6th ed.
• x'd - The Oxford Dictionary of Abbreviations
• X-1 Plane - Dictionary of American History
• x-height - The Oxford Dictionary of Abbreviations
• X-linked disease - A Dictionary of Nursing
• X-linked lymphoproliferative syndrome - A Dictionary of Nursing
• X-ON/X-OFF - A Dictionary of Computing
• X-OPEN - A Dictionary of Computing
• X-plan diet - A Dictionary of Food and Nutrition
• X-rated - Oxford Dictionary of Rhymes
• X-rated - The Oxford Pocket Dictionary of Current English
• X-Ray Glasses - How Products Are Made
• X-ray photography - A Dictionary of Earth Sciences
• X-ray powder photograph - A Dictionary of Earth Sciences
• X-ray screening - A Dictionary of Nursing
• X-Ray Spex - Contemporary Musicians
• X-series - A Dictionary of Computing
• X-tgd - The Oxford Dictionary of Abbreviations
• X-Windows - The Oxford Dictionary of Abbreviations
• x.c.l. - The Oxford Dictionary of Abbreviations
• x.rts - The Oxford Dictionary of Abbreviations
• x/nt - The Oxford Dictionary of Abbreviations
• x/wb - The Oxford Dictionary of Abbreviations
• X2 - The Oxford Dictionary of Abbreviations
• X4 - The Oxford Dictionary of Abbreviations
• X5 - The Oxford Dictionary of Abbreviations
• xa - The Oxford Dictionary of Abbreviations
• Xaa - The Oxford Dictionary of Abbreviations
• Xala - International Dictionary of Films and Filmmakers
• Xalapa - The Columbia Encyclopedia, 6th ed.
• xan. - The Oxford Dictionary of Abbreviations
• Xangold - A Dictionary of Food and Nutrition
• xanthaemia - A Dictionary of Nursing
• xanthan gum - A Dictionary of Food and Nutrition
• Xanthe - Oxford Dictionary of Rhymes
• xanthelasma - A Dictionary of Food and Nutrition
• xanthelasma - A Dictionary of Nursing
• xanthia - A Dictionary of Food and Nutrition
• Xanthian Marbles - The Oxford Dictionary of Phrase and Fable
• Xanthidae - A Dictionary of Zoology
• Xanthippe - The Oxford Dictionary of Phrase and Fable
• Xanthippe - Oxford Dictionary of Rhymes
• xantho(o)- - The Concise Oxford Dictionary of English Etymology
• xantho- - A Dictionary of Nursing
• xanthochromia - A Dictionary of Nursing
• xanthoma - A Dictionary of Nursing
• xanthomatosis - A Dictionary of Nursing
• Xanthomonas - A Dictionary of Plant Sciences
• xanthophyll - A Dictionary of Plant Sciences
• xanthophyllite - A Dictionary of Earth Sciences
• Xanthophyllum - A Dictionary of Plant Sciences
• xanthopsia - A Dictionary of Nursing
• Xanthoria - A Dictionary of Plant Sciences
• Xanthorrhoea - A Dictionary of Plant Sciences
• Xanthorrhoeaceae - A Dictionary of Plant Sciences
• xanthosis - A Dictionary of Food and Nutrition
• Xanthosoma - A Dictionary of Plant Sciences
• Xanthus - The Columbia Encyclopedia, 6th ed.
• XAS - The Oxford Dictionary of Abbreviations
• Xavante - Junior Worldmark Encyclopedia of World Cultures
• Xavier - Oxford Dictionary of Rhymes
• xb - The Oxford Dictionary of Abbreviations
• Xber - The Oxford Dictionary of Abbreviations
• Xbre - The Oxford Dictionary of Abbreviations
• xbt - The Oxford Dictionary of Abbreviations