Etymology
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escutcheon (n.)

"shield on which a coat of arms is depicted," late 15c., from Old North French escuchon, variant of Old French escusson "half-crown (coin); coat of arms, heraldic escutcheon," from Vulgar Latin *scutionem, from Latin scutum "shield," from PIE *skoito- "piece of wood, sheath, shield" (source also of Old Irish sciath, Welsh ysgwyd, Breton scoed "shield;" Old Prussian staytan "shield;" Russian ščit "shield"), probably a noun derivative of a variant of PIE root *skei- "to cut, split," on the notion of "board."

Escutcheon of pretense, in her., a small escutcheon charged upon the main escutcheon, indicating the wearer's pretensions to some distinction, or to an estate, armorial bearings, etc., which are not his by strict right of descent. It is especially used to denote the marriage of the bearer to an heiress whose arms it bears. Also called inescutcheon. [Century Dictionary]
Clev. Without doubt: he is a Knight?
Jord. Yes Sir.
Clev. He is a Fool too?
Jord. A little shallow[,] my Brother writes me word, but that is a blot in many a Knights Escutcheon.
[Edward Ravenscroft, "Mamamouchi, or the Citizen Turn'd Gentleman," 1675]
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scutcheon (n.)

"shield for armorial bearings," mid-14c., short for escutcheon.

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escudo (n.)
Spanish and Portuguese coin, 1821, from Spanish/Portuguese escudo, from Latin scutum "a shield" (see escutcheon). Also compare ecu.
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ecu (n.)
old French silver coin, 1704, from French écu, "a shield," also the name of a coin, from Old French escu (12c.) "shield, coat of arms," also the name of a coin with three fleur-de-lys stamped on it as on the shield, formerly escut, from Latin scutum "shield" (see escutcheon). First issued by Louis IX (1226-1270); so called because the shield of France was imprinted on them.
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Scutum 

constellation, added 1687 by Polish astronomer Johannes Hevelius, originally Scutum Sobiescanum "Shield of (King John) Sobeski," the 17c. Polish monarch famous as the savior of Christendom for his victory over the Ottomans at the Battle of Vienna (1683). The name was later shortened. From Latin scutum "shield" (see escutcheon). Middle English had scutifer "shield-bearer (late 14c.), from Medieval Latin.

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scudo (n.)

old Italian silver coin current 17c.-19c., 1640s, Italian, literally "shield" (in reference to the device it bore), from Latin scutum "a shield," in Medieval Latin "a coin" (see escutcheon). Also compare Anglo-French scute, variant of Old French escu (see ecu) and Middle English scute "French gold coin worth about half an English noble," c. 1400, from Medieval Latin.

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scuttle (n.)

Middle English scutel "dish; basket, winnowing basket," from late Old English scutel "broad, shallow dish; platter," from Latin scutella "serving platter" (source also of Old French escuelle, Modern French écuelle, Spanish escudilla, Italian scudella "a plate, bowl"), diminutive of scutra "flat tray, dish," which is perhaps related to scutum "shield" (see escutcheon).

A common Germanic borrowing from Latin (Old Norse skutill, Middle Dutch schotel, Old High German scuzzila, German Schüssel "a dish"). The meaning "basket for sifting grain" is attested from mid-14c.; the sense of "deep, sheet-metal bucket for holding small amounts of coal" is by 1849, short for coal-scuttle. An Arnaldus Scutelmuth turns up in a roll from 1275.

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esquire (n.)

late 14c., from Old French escuier "shield-bearer (attendant young man in training to be a knight), groom" (Modern French écuyer), from Medieval Latin scutarius "shield-bearer, guardsman" (in classical Latin, "shield-maker"), from scutum "shield" (see escutcheon). For initial e-, see e-. Compare squire (n.). Originally the feudal rank below knight, sense broadened 16c. to a general title of courtesy or respect for the educated and professional class, especially, later, in U.S., regarded as belonging especially to lawyers.

In our own dear title-bearing, democratic land, the title of esquire, officially and by courtesy, has come to include pretty much everybody. Of course everybody in office is an esquire, and all who have been in office enjoy and glory in the title. And what with a standing army of legislators, an elective and ever-changing magistracy, and almost a whole population of militia officers, present and past, all named as esquires in their commissions, the title is nearly universal. [N.Y. Commercial Advertiser newspaper, quoted in Bartlett, 1859]
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*skei- 
Proto-Indo-European root meaning "to cut, split," extension of root *sek- "to cut."

It forms all or part of: abscissa; conscience; conscious; ecu; escudo; escutcheon; esquire; nescience; nescient; nice; omniscience; omniscient; plebiscite; prescience; prescient; rescind; rescission; science; scienter; scilicet; sciolist; scission; schism; schist; schizo-; schizophrenia; scudo; sheath; sheathe; sheave (n.) "grooved wheel to receive a cord, pulley;" shed (v.) "cast off;" shin (n.) "fore part of the lower leg;" shingle (n.1) "thin piece of wood;" shit (v.); shive; shiver (n.1) "small piece, splinter, fragment, chip;" shoddy; shyster; skene; ski; skive (v.1) "split or cut into strips, pare off, grind away;" squire.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit chindhi, chinatti "to break, split up;" Avestan a-sista- "unsplit, unharmed," Greek skhizein "to split, cleave, part, separate;" Latin scindere "to cut, rend, tear asunder, split;" Armenian c'tim "to tear, scratch;" Lithuanian skiesti "to separate, divide;" Old Church Slavonic cediti "to strain;" Old English scitan, Old Norse skita "to defecate;" Old English sceað, Old High German sceida "sheath;" Old Irish sceid "to vomit, spit;" Welsh chwydu "to break open."
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fess (n.)
wide horizontal band across an escutcheon, late 15c., from Old French faisce, from Latin fascia "a band" (see fasces).
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