[The egomaniac, as opposed to the megalomaniac,] does not regard it as necessary to dream of himself as occupying some invented social position. He does not require the world or its appreciation to justify in his own eyes himself as the sole object of his own interest. He does not see the world at all. Other people simply do not exist for him. The whole 'non-Ego' appears in his consciousness merely as a vague shadow or a thin cloud. The idea does not even occur to him that he is something out of the common, that he is superior to other people, and for this reason either admired or hated ; he is alone in the world ; more than that, he alone is the world and everything else, men, animals, things are unimportant accessories, not worth thinking about. [Max Nordau, "Degeneration," English translation, 1895]
Nordau's book was much-read, debated, and cited at the time and the word was associated with him (e.g. The Agora, July 1895).
Walker's use aside, its infrequent print appearance before 1895 seems to have been largely in the side of medicine that dealt with psychological matters:
The most frequent, yet the most extraordinary of these perversions of temper, are seen in young females. It is a species of aberration of the intellect, but short of insanity, real enough, but exaggerated, fictitious, factitious, and real at the same time. It frequently has its origin in dyspepsia, hysteria, or other malady, and in emotion of various kinds, such as disappointment, vexation, &c. Its object is frequently to excite and to maintain a state of active sympathy and attention, for which there, is as it were, a perpetual, morbid, and jealous thirst. It was rather aptly designated, by the clever relative of one patient, an ego-mania. [Marshall Hall, M.D., "Practical Observations and Suggestions in Medicine," London, 1845]
12c., a shortening of Old English ic, the first person singular nominative pronoun, from Proto-Germanic *ek (source also of Old Frisian ik, Old Norse ek, Norwegian eg, Danish jeg, Old High German ih, German ich, Gothic ik), from PIE *eg- "I," nominative form of the first person singular pronoun (source also of Sanskrit aham, Hittite uk, Latin ego (source of French Je), Greek ego, Russian ja, Lithuanian aš).
Reduced to i by mid-12c. in northern England, later everywhere; the form ich or ik, especially before vowels, lingered in northern England until c. 1400 and survived in southern dialects until 18c. It began to be capitalized mid-13c. to mark it as a distinct word and avoid misreading in handwritten manuscripts.
The reason for writing I is ... the orthographic habit in the middle ages of using a 'long i' (that is, j or I) whenever the letter was isolated or formed the last letter of a group; the numeral 'one' was written j or I (and three iij, etc.), just as much as the pronoun. [Otto Jespersen, "Growth and Structure of the English Language," p.233]
The dot on the "small" letter -i- began to appear in 11c. Latin manuscripts to distinguish the letter from the stroke of another letter (such as -m- or -n-). Originally a diacritic, it was reduced to a dot with the introduction of Roman type fonts. The letter -y- also was written with a top dot in Old English and early Middle English, during the centuries when -i- tended to be written with a closed loop at the top and thus was almost indistinguishable from the lower-case thorn (þ). In names of U.S. highways (by 1966) it is short for Interstate (adj.).
"an eating-house, establishment where meals may be bought and eaten," 1821, from French restaurant "a restaurant," originally "food that restores," noun use of present participle of restaurer "to restore or refresh," from Old French restorer (see restore).
In 1765 a man by the name of Boulanger, also known as "Champ d'Oiseaux" or "Chantoiseau," opened a shop near the Louvre (on either the rue des Poulies or the rue Bailleul, depending on which authority one chooses to believe). There he sold what he called restaurants or bouillons restaurants—that is, meat-based consommés intended to "restore" a person's strength. Ever since the Middle Ages the word restaurant had been used to describe any of a variety of rich bouillons made with chicken, beef, roots of one sort or another, onions, herbs, and, according to some recipes, spices, crystallized sugar, toasted bread, barley, butter, and even exotic ingredients such as dried rose petals, Damascus grapes, and amber. In order to entice customers into his shop, Boulanger had inscribed on his window a line from the Gospels: "Venite ad me omnes qui stomacho laboratis et ego vos restaurabo." He was not content simply to serve bouillon, however. He also served leg of lamb in white sauce, thereby infringing the monopoly of the caterers' guild. The guild filed suit, which to everyone's astonishment ended in a judgment in favor of Boulanger. [Jean-Robert Pitte, "The Rise of the Restaurant," in "Food: A Culinary History from Antiquity to the Present," English editor Albert Sonnenfeld, transl. Clarissa Botsford, 1999, Columbia University Press]
Italian spelling ristorante attested in English by 1925. Middle English had similar words in legal language, such as restaurance "restitution." The railroad restaurant car (1872) was one adapted to afford meals to passengers while travelling.