D

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D1 / dē/ (also d) • n. (pl. Dsor D's) 1. the fourth letter of the alphabet. ∎  denoting the fourth in a set of items, categories, sizes, etc. ∎  the fourth highest category of academic mark.2. (D) a shape like that of a capital D: [in comb.] the D-shaped handle. ∎  a loop or ring of this shape.3. (usu. D) Mus. the second note of the diatonic scale of C major. ∎  a key based on a scale with D as its keynote.4. the Roman numeral for 500.D2 • abbr. ∎  Democrat or Democratic. ∎  depth (in the sense of the dimension of an object from front to back). ∎  Chem. dextrorotatory: D-glucose. ∎  (with a numeral) dimension(s) or dimensional: a 3-D model. ∎  (in tables of sports results) drawn. ∎  (on an automatic gearshift) drive. ∎  (in personal ads) divorced.• symb. ∎  Physics electric flux density. ∎  Chem. deuterium.

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