Hi Ani,
I used to do the same things as you do - earlier I used to make a point to read the meanings - but now I can either guess its meaning from the context or let it pass (well sometimes these words are just descriptions of things that are not very imp to the story.. U understand na?)...
But I think I do have these words stored somewhere in my sub-conscious mind - because the next time I read the word somewhere, I either ask my dad or friends about the word and if that fails I use the dictionary..
I have changed my trend though, I use the wikipedia now-a-days !!(literally..!! it is so much more advanced that you not only know the meaning but also end up learning a whole lot of things related to it.!

)
Gayathri