Noun

Definition: An autopsy is a postmortem assessment or examination of a body to determine the cause of death. An autopsy is performed by a physician trained in pathology.

Source: http://medical-dictionary.thefreedictionary.com/autopsy

I came across this word when my friend came up to me and asked if i wanted to see a video of a autopsy. Since i did not know what it was, i was curious and decided to watch the video.

i did not really have to check in a dictionary to check what was an autopsy. The video made it pretty clear to me of what it was. Knowing the definition of an autopsy helped me understand the purpose of a autopsy.