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dia|boli|cal /da I əbɒ l I k ^ə l/ ADJ If you describe something as diabolical , you are emphasizing that it is very bad, extreme, or unpleasant. [INFORMAL , EMPHASIS ] □  It was a diabolical error, a schoolboy error. ●  dia|boli|cal|ly /da I əbɒ l I kli/ ADV □  …diabolically difficult clues.

dia|dem /da I ədem/ (diadems ) N‑COUNT A diadem is a small crown with precious stones in it.

di|ag|nose /da I əgnoʊz, [AM ] -noʊs/ (diagnoses , diagnosing , diagnosed ) VERB If someone or something is diagnosed as having a particular illness or problem, their illness or problem is identified. If an illness or problem is diagnosed , it is identified. □ [be V -ed + as ] The soldiers were diagnosed as having flu. □ [be V -ed + with ] Susan had a mental breakdown and was diagnosed with schizophrenia. □ [be V -ed + as ] In 1894 her illness was diagnosed as cancer. □ [V n] He could diagnose an engine problem simply by listening. [Also be V -ed adj]

di|ag|no|sis /da I əgnoʊ s I s/ (diagnoses ) N‑VAR Diagnosis is the discovery and naming of what is wrong with someone who is ill or with something that is not working properly. □  I need to have a second test to confirm the diagnosis.

di|ag|nos|tic /da I əgnɒ st I k/ ADJ [ADJ n] Diagnostic equipment, methods, or systems are used for discovering what is wrong with people who are ill or with things that do not work properly. □  …X-rays and other diagnostic tools.

di|ago|nal /da I æ gən ^ə l/ (diagonals )

1 ADJ [usu ADJ n] A diagonal line or movement goes in a sloping direction, for example, from one corner of a square across to the opposite corner. □  …a pattern of diagonal lines. ●  di|ago|nal|ly ADV [ADV with v] □  Vaulting the stile, he headed diagonally across the paddock.

2 N‑COUNT A diagonal is a line that goes in a sloping direction. □  The bed linen is patterned in stylish checks, stripes, diagonals and triangles.

3 N‑COUNT In geometry, a diagonal is a straight line that joins two opposite corners in a flat four-sided shape such as a square. □  Mark five points an equal distance apart along the diagonals.

dia|gram /da I əgræm/ (diagrams ) N‑COUNT A diagram is a simple drawing which consists mainly of lines and is used, for example, to explain how a machine works. □  You can reduce long explanations to simple charts or diagrams.

dia|gram|mat|ic /da I əgrəmæ t I k/ ADJ [usu ADJ n] Something that is in diagrammatic form is arranged or drawn as a diagram. □  This is the virus in very crude simple diagrammatic form.

dial /da I əl/ (dials , dialling , dialled ) in AM, use dialing , dialed 1 N‑COUNT A dial is the part of a machine or instrument such as a clock or watch which shows you the time or a measurement that has been recorded. □  The luminous dial on the clock showed five minutes to seven.

2 N‑COUNT A dial is a control on a device or piece of equipment which you can move in order to adjust the setting, for example to select or change the frequency on a radio or the temperature of a heater. □  He turned the dial on the radio.

3 N‑COUNT On some telephones, especially older ones, the dial is the disc on the front that you turn with your finger to choose the number that you want to call. The disc has holes in it, and numbers or letters behind the holes.

4 VERB If you dial or if you dial a number, you turn the dial or press the buttons on a telephone in order to phone someone. □ [V n] He lifted the phone and dialled her number. □ [V ] He dialled, and spoke briefly to the duty officer.