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dopester (informal) one who makes analyses and predictions, as of the outcome of an athletic or political contest.
dopey (informal) sleepy, sluggish, or dazed from or as if from the use of alcohol or drugs. [2 definitions]
doppelgänger the supposed ghostly twin of a living person, esp. one that haunts a real person.
Doppler effect the apparent shift in frequency of waves, as of sound or light, if the source and receptor are in motion relative to each other. The frequency appears to become greater if they move closer and become less if they move apart.
d'or (French) of gold.
Doric of, pertaining to, designating, or characteristic of the earliest and simplest order of classical Greek architecture, later adapted by the Romans, esp. its typical fluted columns with simple capitals. [3 definitions]
d'or, in a field azure (combined French and English) of gold, on a blue background.
dorm (informal) dormitory.
dormant asleep or seemingly asleep; sluggish. [5 definitions]
dormer a window set vertically into a projecting structure on a sloping roof; dormer window. [2 definitions]
dormitory a residential hall, esp. at a college. [2 definitions]
dormouse any of various small European rodents that have furry tails and resemble squirrels in habits and appearance.
Dorothea Dix U.S. social activist, reformer, and Union army Superintendent of Women Nurses, who worked to improve prison conditions and to provide asylums for the mentally ill (b.1802--d.1887).
dorsal of, upon, near, or related to the back, as an organ or part of an animal. (Cf. ventral.) [2 definitions]
dory1 a small, narrow, flat-bottomed boat that has high flaring sides and a sharply pointed prow.
dory2 either of two fishes of the Atlantic that have narrow, flattened bodies and spiny fins.
dos-ā-dos do-si-do.
dosage the administration or taking of doses, esp. of medicine. [2 definitions]
do's and don'ts actions or customs, collectively correct or appropriate and wrong or inappropriate, respectively.
dose a specified amount, esp. of medicine, administered or prescribed to be taken at one time or at certain intervals. [6 definitions]
do-si-do a movement in square dancing in which two dancers approach each other, pass around each other back to back, and return to their original positions. [4 definitions]