»aubergine
Although not as tortuous as this might suggest, I had an online adventure. It all began when I wondered about the word juggernaut (not related to astronaut, except through an attempt an English orthographic standardization) when I confirmed my little knowledge of Rath Yatra by looking it up on the internet, which led in turn to Wikipedia, and thence to the discovery that aubergine comes to English through Catalan and Arabic, but ultimately the word comes from Sanskrit.