rogue's cant 16c.-17c. for "a wench, a young girl of the vagrant class," 1560s, of uncertain origin.
A Dell is a yonge wenche, able for generation, and not yet knowen or broken by the vpright man. ... [W]hen they have beene lyen with all by the vpright man then they be Doxes, and no Dells. [Thomas Harman, "A Caveat or Warning for Common Cursitors," 1567]
"rogue's girlfriend, beggar's mistress," 1520s, slang, of unknown origin (see dell (n.2)). Liberman says it is probably from Low German dokke "doll," "with the deterioration of meaning from 'sweetheart' and 'wench' to 'whore.'"
"deep dell or secluded hollow, usually wooded," c. 1200, of unknown origin; a dialectal word until it entered literary use 17c. The Middle English Compendium compares Old English ding "dungeon," Old High German tunc "cellar," Old Norse dyngja "lady's bower."
1796, from Italian Accademia della Crusca, literally "Academy of the Chaff," "the name of an Academy established at Florence in 1582, mainly with the object of sifting and purifying the Italian language; whence its name, and its emblem, a sieve" [OED]. From della "of the" (from Latin de "of" + illa "that") + crusca "bran." Related: Della-Cruscan.
1787, from name of a family of 15c. Florentine painters and sculptors; used of wares made by Luca Della Robbia (1400-1482), or those like them.