n.
1.someone who is so ardently devoted to something that it resembles an addiction
2.someone who is physiologically dependent on a substance addict v.
1.to cause (someone or oneself) to become dependent (on something, especially a narcotic drug)
Idiom of the Day
in one ear and out the other
heard and then immediately forgotten
Everything that the teacher says seems to go in one ear and out the other for my friend.