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Doomsday (n.)[Doomsday 词源字典]: Old English domes dæg, from domes, genitive of dom (see doom (n.)) + dæg "day" (see day (n.)).

In medieval England it was expected when the world's age reached 6,000 years from creation, which was thought to have been in 5200 B.C. Bede, c.720, complained of being pestered by rustici asking him how many years till the sixth millennium ended. There is no evidence for a general panic in the year 1000 C.E. Doomsday machine "bomb powerful enough to wipe out human life on earth" is from 1960.[Doomsday etymology, Doomsday origin, 英语词源]
door (n.): Middle English merger of Old English dor (neuter; plural doru) "large door, gate," and Old English duru (fem., plural dura) "door, gate, wicket;" both from Proto-Germanic *dur- (cognates: Old Saxon duru, Old Norse dyrr, Danish dør, Old Frisian dure, Old High German turi, German Tür).

The Germanic words are from PIE *dhwer- "a doorway, a door, a gate" (cognates: Greek thyra, Latin foris, Gaulish doro "mouth," Gothic dauro "gate," Sanskrit dvárah "door, gate," Old Persian duvara- "door," Old Prussian dwaris "gate," Russian dver' "a door").

The base form is frequently in dual or plural, leading to speculation that houses of the original Indo-Europeans had doors with two swinging halves. Middle English had both dure and dor; form dore predominated by 16c., but was supplanted by door.
A door is what a dog is perpetually on the wrong side of. [Ogden Nash]
doorbell (n.): c. 1815, from door + bell (n.).
doorknob (n.): 1847, American English, from door + knob.
doormat (n.): 1660s, from door + mat. Figurative use from 1861.
doorstep (n.): 1810, from door + step (n.).
doorway (n.): 1799, from door + way (n.).
dooryard (n.): c. 1764, American English, from door + yard (n.1).
doozy: also doozie, 1903 (adj.), 1916 (n.), perhaps an alteration of daisy, or from popular Italian actress Eleonora Duse (1859-1924). In either case, reinforced by Duesenberg, the expensive, classy make of automobile from the 1920s-30s.
dopamine: 1959, from DOPA, the amino acid (from first letter of elements of dioxyphenylalanine), + -amine.
dope (n.): 1807, American English, "sauce, gravy, thick liquid," from Dutch doop "thick dipping sauce," from doopen "to dip" (see dip (v.)). Extension to "drug" is 1889, from practice of smoking semi-liquid opium preparation. Meaning "foolish, stupid person" is older (1851) and may have a sense of "thick-headed." Sense of "inside information" (1901) may come from knowing before the race which horse had been drugged to influence performance. Dope-fiend is attested from 1896.
dope (v.): 1889, from dope (n.). Related: Doped; doping.
dopey (adj.): 1896, from dope (n.) + -y (2).
doppelganger (n.): 1830, from German Doppelgänger, literally "double-goer," originally with a ghostly sense. See double + gang (n.). Sometimes half-anglicized as doubleganger.
Doppler: 1871, in reference to Christian Doppler (1803-1853), Austrian scientist, who in 1842 explained the effect of relative motion on waves (originally to explain color changes in binary stars); proved by musicians performing on a moving train. Doppler shift is the change of frequency resulting from the Doppler effect. The surname is literally "Gambler."
Dora: fem. proper name, short for Dorothy, Dorothea.
Dorcas: fem. proper name, from Greek dorkas "gazelle, deer." Dorcas Society "ladies' meeting to make clothes for the poor" (1832) is from Acts ix:36-41.
Dorchester: Old English Dorcanceaster, earlier Dornwaraceaster, from Latin Durnovaria, from Romano-British *duro- "walled town."
dord (n.): 1934, a ghost word printed in "Webster's New International Dictionary" and defined as a noun used by physicists and chemists, meaning "density." In sorting out and separating abbreviations from words in preparing the dictionary's second edition, a card marked "D or d" meaning "density" somehow migrated from the "abbreviations" stack to the "words" stack. The "D or d" entry ended up being typeset as a word, dord, and defined as a synonym for density. The mistake was discovered in 1939.
Dorian (adj.): c. 1600, in reference to the mode of ancient Greek music, literally "of Doris," from Greek Doris, district in central Greece, traditionally named for Doros, legendary ancestor of the Dorians, whose name is probably related to doron "gift" (see date (n.1)).