bīˈvōlˌtēn, (ˈ) ̷ ̷| ̷ ̷_t ə n adjective
also bi·vol·tin -_t ə n
Etymology: French bivoltin, from bi- bi- (I) + Italian volta time, instance (from — assumed — Vulgar Latin volvita, from Latin volvere to turn) + French -in -ine — more at voluble
1. : producing two broods in a season — used especially of silkworms
2. of insects : having two generations a year, a summer generation without diapause and a winter generation with diapause
• bi·vol·tin·ism -_t ə nˌizəm noun -s