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virtue [virtue 词源字典]: virtue: [13] Latin virtūs ‘bravery, strength, capacity, skill, merit’ was derived from vir ‘man’ (source also of English virago ‘manlike woman’ [14] and virile [15]), and so etymologically it denoted ‘manliness’. It passed into English via Old French vertu. Derivatives include virtual [14] which, preserving another semantic aspect of its source, originally meant ‘having power, in effect’, but by the 17th century had evolved into its modern sense ‘so in effect or in essence’; and virtuoso [17], which was borrowed from Italian and goes back to the ancestral sense ‘skill’.
=> virago, virile, virtual, virtuoso[virtue etymology, virtue origin, 英语词源]
miracle (n.): mid-12c., "a wondrous work of God," from Old French miracle (11c.) "miracle, story of a miracle, miracle play," from Latin miraculum "object of wonder" (in Church Latin, "marvelous event caused by God"), from mirari "to wonder at, marvel, be astonished," figuratively "to regard, esteem," from mirus "wonderful, astonishing, amazing," earlier *smeiros, from PIE *smei- "to smile, laugh" (cognates: Sanskrit smerah "smiling," Greek meidan "to smile," Old Church Slavonic smejo "to laugh;" see smile (v.)).

From mid-13c. as "extraordinary or remarkable feat," without regard to deity. Replaced Old English wundortacen, wundorweorc. The Greek words rendered as miracle in the English bibles were semeion "sign," teras "wonder," and dynamis "power," in Vulgate translated respectively as signum, prodigium, and virtus. The Latin word is the source of Spanish milagro, Italian miracolo.
virtu (n.): "excellence in an object of art, passion for works of art," 1722, from Italian virtu "excellence," from Latin virtutem (nominative virtus) "virtue, goodness, manliness" (see virtue). The same word as virtue, borrowed during a period when everything Italian was in vogue. Sometimes spelled vertu, as though from French, but this sense of the word is not in French.
virtual (adj.): late 14c., "influencing by physical virtues or capabilities, effective with respect to inherent natural qualities," from Medieval Latin virtualis, from Latin virtus "excellence, potency, efficacy," literally "manliness, manhood" (see virtue). The meaning "being something in essence or effect, though not actually or in fact" is from mid-15c., probably via sense of "capable of producing a certain effect" (early 15c.). Computer sense of "not physically existing but made to appear by software" is attested from 1959.
virtue (n.): c. 1200, vertu, "moral life and conduct; a particular moral excellence," from Anglo-French and Old French vertu "force, strength, vigor; moral strength; qualities, abilities" (10c. in Old French), from Latin virtutem (nominative virtus) "moral strength, high character, goodness; manliness; valor, bravery, courage (in war); excellence, worth," from vir "man" (see virile).
For my part I honour with the name of virtue the habit of acting in a way troublesome to oneself and useful to others. [Stendhal "de l'Amour," 1822]
Especially (in women) "chastity, sexual purity" from 1590s. Phrase by virtue of (early 13c.) preserves alternative Middle English sense of "efficacy." Wyclif Bible has virtue where KJV uses power. The seven cardinal virtues (early 14c.) were divided into the natural (justice, prudence, temperance, fortitude) and the theological (hope, faith, charity). To make a virtue of a necessity (late 14c.) translates Latin facere de necessitate virtutem [Jerome].
virtuous (adj.): c. 1300, "characterized by vigor or strength; having qualities befitting a knight; valiant, hardy, courageous;" from Old French vertuos "righteous; potent; of good quality; mighty, valiant, brave" (12c.), from Late Latin virtuosus "good, virtuous," from Latin virtus (see virtue). From mid-14c. in English as "having beneficial or efficacious properties;" late 14c. (of persons) as "having excellent moral qualities; conforming to religious law." Related: Virtuously; virtuousness.