Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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Ph.D. abbreviation of "philosophiae doctor" (Latin); Doctor of Philosophy.
Q.E.D. abbreviation of "quod erat demonstrandum" (Latin); which was to be demonstrated.
R and D abbreviation of "research and development."
vitamin D in human nutrition, a sterol produced in the liver, or any of several closely related sterols found in fish, eggs, or fortified milk, required for proper bone development and calcium absorption.