Definition of "inescutcheon"

All the quartered Arms that I meet vvith belonging to Scottiſh Families, do not exceed ſix different Coats of Arms, vvhich are marſhalled after theſe three vvays, Plain Quartering, Quartering, and Counter-quartering, of vvhich I have treated and illuſtrate by Examples, vvith their Surtouts and Ineſcutcheons.

1718, Alexander Nisbet, “Of Arms of Alliances, with the Method of Marshalling Them and Others Quarterly”, in An Essay on the Ancient and Modern Use of Armories; […], Edinburgh: […] William Adams Junior, for Mr. James Mack Euen, […], page 112

[A]n Ineſcutcheon is properly the Charge of a Shield, and born vvithin a 'Scutcheon or Shield, […]

1724, John Guillim, chapter VII, in A Display of Heraldry. , page 49, column 1

When only one escutcheon is borne as a charge, it is now generally termed an inescutcheon, but in the early rolls there is no such distinction.

1852, J[ames] R[obinson] Planché, “Artificial Objects”, in The Pursuivant of Arms, or Heraldry Founded upon Facts, London: W. N. Wright, […], page 124

When he became titular bishop of Hippo and auxiliary bishop of Boston, he added an inescutcheon or small shield in the center of his shield bearing a gold heart inflamed pierced by an arrow and on a blue field. Since titular bishops do not impale their personal arms with those of the see, this was a convenient reference to his titular see.

1992, Duane L. C. M. Galles, “The Reform of Ecclesiastical Heraldry Revisited”, in The American Benedictine Review, volume 43, number 4, Atchison, Kan.: American Benedictine Review, footnote 15, page 424