Is there a word to describe when a part becomes the name for the whole, particularly in a jargon sense?
For example, a door to door salesman at the end of the day might talk about how many "doors" he visited, rather than houses, or a pathology nurse might talk about "doing veins" rather seeing patients?
I read a definition along these lines years and years ago, but I've completely forgotten the word. If possible I'm trying to find this same word again.