The story
- Italian · derived frombiscotto
- German · derived fromZwieback
- English todayzwieback
From German Zwieback, from zwie- (“twi-, two-”) + backen (“to bake”) (i.e. “twice-baked”), a calque of Italian biscotto (but not to be confused with it).
Etymology from Wiktionary, CC BY-SA 4.0.