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dinosaur one of a group of extinct animals. Some kinds of dinosaurs were the largest animals that ever lived on land. Other dinosaurs were as small as chickens. The first kinds of dinosaurs developed over two hundred million years ago. The last kinds became extinct about sixty-five million years ago.
diocese a group of churches or a district under the authority of a bishop.
diorama a scene represented by objects in the form of people, animals, or things, placed in front of a painted background.
dioxide a compound containing two atoms of oxygen bound to a single atom of another element.
dip to put into a liquid briefly. [8 definitions]
diploma an official piece of paper stating that a student has earned a degree or finished a course of study. High schools, colleges, and universities give out diplomas.
diplomat a person whose job is to handle relations with the governments of other countries. [2 definitions]
diplomatic of or relating to diplomats. [2 definitions]
dipper a cup with a long handle used to lift liquids. [2 definitions]
dire causing, likely to cause, or involving terror or suffering. [2 definitions]
direct to give instructions that lead or guide. [9 definitions]
direct current an electric current that flows in one direction.
direction control or guidance. [4 definitions]
directly in a direct line or way; straight. [3 definitions]
direct object the part of a sentence that shows the object, goal, or receiver of the action of a verb. "The ball" in "She kicked the ball" is a direct object.
director a person who guides the affairs of a business or other organization. [2 definitions]
directory a list of names and addresses of people or businesses.
dirigible an airship that can be steered or guided, such as a blimp.
dirt loose earth or soil. [2 definitions]
dirty not clean; soiled. [6 definitions]
dis- a prefix that means "not" or "lack of." [2 definitions]