Slang A narcotics addict, especially one using heroin.(noun)
Slang One who has an insatiable interest or devotion: a sports junkie. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "junkie" in a sentence
"Don't call her an addict: Marisa Woolsey prefers the term "junkie" -- "infomercial junkie," that is."
"Like the label junkie that I am, I immediately bought colored labels, hoping to color code boxes by room and stick a key to the colors on the door so that the poor schleps who end up helping me will understand my system."
"And Midge, Don's one-time Bohemian lover, is a heroin junkie peddling her paintings and even herself for the next fix."