Do you know ghouls from goblins and ghosts?
"eggplant," 1794, from French aubergine, "fruit of the eggplant" (Solanum esculentum), diminutive of auberge "a kind of peach," variant of alberge, from Spanish alberchigo "apricot" [OED]. Klein derives the French word from Catalan alberginera, from Arabic al-badinjan "the eggplant," from Persian badin-gan, from Sanskrit vatin-ganah. As a color like that of the eggplant fruit, it is attested from 1895.
A secret term used to refer to computers in the presence of computerphobic third parties.