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diabetes a disease in which there is too much blood sugar. People with diabetes are treated with insulin, which the body needs to use sugar properly.
diabetic of or resulting from diabetes. [2 definitions]
diabolic very evil; devilish.
diagnosis the act or process of finding out the nature of an illness or injury by examining its signs and symptoms. [2 definitions]
diagonal joining one corner to the opposite corner of a square, rectangle, or other flat shape with straight sides. [2 definitions]
diagram a drawing or plan that shows the parts of something or how the parts work together. [2 definitions]
dial a disk that has numbers and a moving pointer that shows time, weight, speed, or some other measure. [6 definitions]
dialect a form of a language that is spoken in a specific region or by a specific group of people.
dialing code the British word for the set of digits at the beginning of a telephone number that represents a telephone district. Dialing code has a meaning similar to area code.
dialogue a talk between two or more people or between characters in a play, film, or novel.
dial tone the steady hum or buzzing sound in a telephone receiver showing that the line is open and a number may be dialed or entered.
diameter a straight line from one side of a circle or sphere to the other that passes through the center. [3 definitions]
diamond a clear mineral that is a crystal form of pure carbon. Diamonds are the hardest natural substance known. They are used in making jewelry and as tools for cutting hard materials. [5 definitions]
diaper a baby's underwear of soft cloth or paper folded between the legs and fastened at the waist.
diaphragm a wall of muscle that separates the chest and abdomen in humans and certain animals. [2 definitions]
diarrhea a condition marked by frequent and watery bowel movements.
diary a daily record of a person's experiences and thoughts. [2 definitions]
dice small cubes with dots on each side numbering one to six. Dice are often used in pairs for board games and games of chance. [2 definitions]
dictate to say or read aloud for someone to write down or for a machine to record. [3 definitions]
dictator a ruler who has total authority.
dictionary a book, or a source of information found on a computer, that lists the words of a language in alphabetical order, along with information about their meaning, spelling, and pronunciation.