1. the topmost layer of crust, as of a pie.
2. Informal. the highest social class.
up·per-crust , adjective
aristocracy, aristocratic, elite, gentle, highborn, highbred, imperial, kingly, patrician, thoroughbred, queenly, titled, wellborn, flower, gentility, gentry, nobility, patriciate, quality, glitterati
upper carboniferous, upper case, upper chamber, upper chinook, upper class, upper darby, upper deck, upper east side, upper egypt, upper extremity
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Origin: 1425–75; 1830–35 for def 2; late Middle English
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