Searching vocabulary in batch processes, in online dictionaries.

[Pyrrhonic]

How to automatically search definitions for a bunch of words in any online English dictionary?
Is there any dictionary online in which you upload a list of words and as the output you get one definition for each one of the words? To do this massively, instead of having to search one by one.
If anyone suggests ways to deal with unknown vocabulary from books, strategies for searching definitions effectively, that's welcome as well.
Thanks in advance.

[Afriendinneed]

I hate dictionaries. I prefer to absorb the meanings over time. Otherwise the definitions fall out of my head. I find them HARD WORK. Much harder work than forgetting about the words I don't get.

[Pyrrhonic]

Ok thanks for the answer, I've found two websites for searching multiple words in a list.
Searching "easydefine" and "simplevocab" in Google they will appear. According to Alexa, easydefine is more popular, so if popularity is appealing to someone, then you should try that one.