Pretty much, “seeing for yourself”

1650s, “an eye-witnessing, a seeing for oneself,” from Modern Latin autopsia, from Greek autopsia “a seeing with one’s own eyes,” from autos- “self” (see auto-) + opsis “a sight”. The sense of “dissection of a body to determine cause of death” is recorded from 1670s, probably from the same sense in French autopsie (1570s). Related: Autopsic; autoptic. As a verb by 1895. Related: Autopsied.