I have learnt a new word

I was watching Kindaichi tv show today and saw the following
turned your only brother into a vegetable? how could a fire turn someone into a vegetable? watching the scene, I thought the correct word is vegetative, so the brother must have been in a vegetative state.
This is the image that I have been associating with the word vegetable all this while, so in my mind I was like ...
This can't be what it meant, right?
So quickly opened the dictionary and looked up, and found the third definition. It looks like the use of the word in the play wad adequate.
o.k so no more this
l
l
l
bhahaha!!!
by the way, I was forced into thinking of how to compose the above image as well.