"shining, brightness," 1602 (first attested in "Hamlet" iii.2), noun use of adjective sheene "beautiful, bright," from Old English scene, sciene "beautiful; bright, brilliant," from Proto-Germanic *skauniz "conspicuous" (source also of Old Frisian skene, Middle Dutch scone, Dutch schoon, Old High German skoni, German schön "fair, beautiful;" Gothic skaunjai "beautiful"), from PIE root *keu- "to see, observe, perceive." It is related to show (v.).
Meaning "film of oil on water" is from 1970. As an adjective now only in poetic or archaic use, but in Middle English used after a woman's name, or as a noun, "fair one, beautiful woman."
also *skeu- Proto-Indo-European root meaning "to see, observe, perceive."
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit kavih "wise, sage; seer, poet;" Avestan kauui- "seer, poet, wise man;" Middle Iranian škoh "splendor, majesty;" Latin cautio "care, foresight," cautus "careful, heedful," cavere "beware, take heed;" Greek kydos "glory, fame;" Lithuanian kavoti "tend, safeguard;" Armenian cucanem "I show;" Old Church Slavonic čudo "wonder;" Czech (z)koumati "to perceive, be aware of;" Serbian čuvati "watch, heed;" Old English sceawian "to look at," Middle Dutch schoon "beautiful, bright," properly "showy," Old High German scouwon "to watch."
Trojan youth taken by Zeus as his cup-bearer (and lover), from Greek Ganymedes, perhaps a non-Greek name, or from ganymai "I rejoice, am glad" (related to ganos "brightness; sheen; gladness, joy; pride") + medea (plural) "counsels, plans, cunning" (see Medea); taken in Greek folk-etymology to mean "delighting in genitals."
Used figuratively of serving-boys (c. 1600) and catamites (1590s). Associated with Aquarius in the zodiac. As the name of one of the four large satellites of Jupiter, proposed in Latin 1610s, but not widely used before 1847.