scudo (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]

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.

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."