1. [noun] The common roach (Rutilus rutilus)
2. [noun] The California roach, of the monotypic genus Hesperoleucus
3. [noun] (US) A cockroach.
4. [noun] (US) (slang) (smoking) A butt of a marijuana cigarette.
5. [noun] (UK) (slang) (smoking) The filter of a rolled cigarette or joint, made from card or paper.
6. [noun] (nautical) An extra curve of material added to the leech edge of a sail to increase the sail area.
7. [noun] A kind of headdress worn by some of the indigenous peoples of North America.
8. [noun] A roll of hair brushed back from the forehead.
9. [noun] The butt of a marijuana cigarette.
10. [noun] Street names for flunitrazepan.
11. [noun] Any of numerous chiefly nocturnal insects; some are domestic pests.
12. [noun] European freshwater food fish having a greenish back.
13. [verb] Comb (hair) into a roach.
14. [verb] Cut the mane off (a horse).
