The phrase "roach killer" refers to a substance or product that is used to eliminate or get rid of cockroaches, which are pesky insects that can infest homes or buildings. Full definition
You need a proper diagnosis and to make sure the boric acid is medical grade or pharmaceutical grade as opposed to the kind that's just in roach killer.» (health.com)
A few comments about the buying guide's recommendations: Though boric acid is considered by some to have a low toxicity rating, I'm just not comfortable with using roach killer as a waterproofing agent. (mommypotamus.com)
Usage - Most roach killers can be used in both residential and commercial settings. (geekwrapped.com)