Where does “lassaturus” come from?

lassaturus (Latin) comes from Latin lasso, from Latin lassus, from Proto-Indo-European led- — slow; weary.

Definitions

Step	Language	Word	Meaning
1	Latin	lasso	I tire, weary, fatigue, exhaust; I render faint
2	Latin	lassus	weary, faint, tired; exhausted, used up
3	Proto-Indo-European	led-	slow; weary

lassaturus — Etymology, Origin & Word History | Etymology Explorer