Latin word venter comes from Proto-Indo-European *wend-tri-

Detailed word origin of venter

Dictionary entry	Language	Definition
*wend-tri-	Proto-Indo-European (ine-pro)
venter	Latin (lat)	(anatomy) belly, abdomen. (anatomy) body, trunk. (anatomy) stomach. (anatomy) womb. Gluttony. Sensual lust. Unborn offspring, especially son.