Etymology
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fleur-de-lis (n.)
also fleur-de-lys, mid-14c., from Anglo-French flour de lis "lily-flower" (see lily), from Old French, literally "flower of the iris," especially borne as a heraldic device on the royal arms of France. There is much dispute over what it is meant to resemble; perhaps an iris flower, or the head of a scepter, or a weapon of some sort. In Middle English often taken as flour delice "flower of joy, lovely flower" (hence Anglo-Latin flos deliciae); also flour de luce "flower of light" (as if from Latin lucem).
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de 

Latin adverb and preposition of separation in space, meaning "down from, off, away from," and figuratively "concerning, by reason of, according to;" from PIE demonstrative stem *de- (see to). Also a French preposition in phrases or proper names, from the Latin word.

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de- 

active word-forming element in English and in many verbs inherited from French and Latin, from Latin de "down, down from, from, off; concerning" (see de), also used as a prefix in Latin, usually meaning "down, off, away, from among, down from," but also "down to the bottom, totally" hence "completely" (intensive or completive), which is its sense in many English words.

As a Latin prefix it also had the function of undoing or reversing a verb's action, and hence it came to be used as a pure privative — "not, do the opposite of, undo" — which is its primary function as a living prefix in English, as in defrost (1895), defuse (1943), de-escalate (1964), etc. In some cases, a reduced form of dis-.

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de jure 

Latin, literally "of law," thus "legitimate, lawful, by right of law, according to law." Jure is ablative of ius "law" (see de +  just (adj.)).

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de rigueur 
1849, French, literally "of strictness," thus "according to obligation of convention." See rigor.
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de minimis 
Latin, literally "of little things," thus, "so minor as to not be worth regarding."
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de-accession (v.)

also deaccession, "remove an entry for an item from the register of a museum, library, etc." (often a euphemism for "to sell"), by 1968, from de- "off, away" + accession, which had been used since 1887 in library publications as a verb meaning "to add to a catalogue." Related: De-accessioned; de-accessioning.

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de-bamboozle (v.)

"undeceive, disabuse," 1919; see de- "do the opposite of" + bamboozle.

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de-ice (v.)

"remove the ice from," 1935, from de- + ice. Related: De-iced; de-icing. Agent noun de-icer is from 1932, originally of airplanes.

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de-orbit (v.)

of a spacecraft, "to leave or move out of orbit," 1958, from de- + orbit. Related: De-orbited; de-orbiting.

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