This is the second conditional " If you read more you would know what "word" means." so I can't use it to talk about the past.
"If you had read more you would know what "word" means." I believe this is more correct but I don't know if it's natural. example:
Bob: ..."word"...
Jack: What does "word" mean?.
Bob: If you had read more you would know what it means, it means...
Jack: Now I understand.