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— di·a·crit·i·cal adjective

di·a·dem noun : CROWN; especially : a royal headband

di·aer·e·sis or di·er·e·sis noun, plural -e·ses : a mark ¨ placed over a vowel to show that it is pronounced in a separate syllable (as in naïve)

diag abbreviation 1 diagonal

2 diagram

di·ag·no·sis noun, plural -no·ses 1 : the art or act of identifying a disease from its signs and symptoms; also : the decision reached by diagnosis

2 a : investigation or analysis of the cause or nature of a condition, situation, or problem

b : a statement or conclusion from an investigation or analysis

— di·ag·nose verb

— di·ag·nos·tic adjective

— di·ag·nos·ti·cian noun

Synonyms

conclusion, decision, deliverance, determination, judgment, opinion, resolution, verdict—more at DECISION

1diagonal adjective 1 : extending from one corner to the opposite corner in a 4-sided figure

2 : running in a slanting direction <~ stripes>

3 : having slanting markings or parts

— di·ag·o·nal·ly adverb

Synonyms

canted, inclined, leaning, listing, oblique, slantwise

2diagonal noun 1 : a diagonal line or plane

2 : a diagonal row, pattern, or direction

3 : a mark / used esp. to mean “or,” “and or,” or “per”

1diagram noun : a design and esp. a drawing that makes something easier to understand

— di·a·gram·ma·ble adjective

— di·a·gram·mat·ic adjective

— di·a·gram·mat·i·cal·ly adverb

Synonyms

figure, graphic, illustration, plate—more at ILLUSTRATION

2diagram verb -grammed or -gramed ; -gram·ming or -gram·ing : to represent by a diagram

1dial noun [ORIGIN: ME dyal, fr. ML dialis clock wheel revolving daily, fr. L dies day]

1 : the face of a sundial

2 : the face of a timepiece

3 : a face with a pointer and numbers that indicate something

4 : a device used for making electrical connections or for regulating operation (as of a radio)

2dial verb di·aled or di·alled; di·al·ing or di·al·ling 1 : to manipulate a dial so as to operate or select

2 : to make a telephone call or connection

Synonyms

call, telephone—more at CALL

3dial abbreviation dialect

di·a·lect noun : a regional variety of a language

Synonyms

argot, cant, jargon, language, lingo, patois, patter, slang, vocabulary; also idiom, parlance, pidgin, speech, tongue, vernacular

di·a·lec·tic noun : the process or art of reasoning by discussion of conflicting ideas; also : the tension between opposing elements

— di·a·lec·ti·cal adjective

dialog box noun : a window on a computer screen for choosing options or inputting information

di·a·logue also di·a·log noun 1 : a conversation between two or more parties

2 : the parts of a literary or dramatic work that represent conversation

Synonyms

colloquy, conversation, discourse, discussion, exchange—more at CONVERSATION

di·al·y·sis noun, plural -y·ses 1 : the separation of substances from solution by means of their unequal diffusion through semipermeable membranes

2 : the medical procedure of removing blood from an artery, purifying it by dialysis, and returning it to a vein

diam abbreviation diameter

di·am·e·ter noun [ORIGIN: ME diametre, fr. MF, fr. L diametros, fr. Gk, fr. dia- through + metron measure]

1 : a straight line passing through the center of a figure or body; especially : one that divides a circle in half

2 : the length of a diameter

di·a·met·ric or di·a·met·ri·cal adjective 1 : of, relating to, or constituting a diameter

2 : completely opposed or opposite

— di·a·met·ri·cal·ly adverb

Synonyms

antipodal, antithetical, contradictory, contrary, opposite, polar—more at OPPOSITE

di·a·mond noun 1 : a hard brilliant mineral that consists of crystalline carbon and is used as a gem

2 : a flat figure having four equal sides, two acute angles, and two obtuse angles

3 : any of a suit of playing cards marked with a red diamond

4 : INFIELD; also : the entire playing field in baseball

di·a·mond·back rattlesnake noun : either of two large and deadly rattlesnakes of the southern U.S.

di