Roach (noun)

1. A common household insect of the Blattidae family, similar to a cockroach.
2. The butt of a marijuana cigarette.

Origin:

From the old english word "ráce" and middle english word "rache" meaning "insect".

Examples:

1. The exterminator came to get rid of the roaches in the kitchen.
2. He stubbed out the roach in the ashtray.
3. The roaches were attracted to the crumbs on the kitchen counter.
4. The roaches were a persistent problem in the apartment building.
5. He rolled the roach into a joint and lit it.