roach /rəʊtʃ $ roʊtʃ/ BrE AmE noun [countable]
[ Sense 1,3: Date: 1800-1900 ; Origin: cockroach ]
[ Sense 2: Date: 1100-1200 ; Language: Old French ; Origin: roche ]
1 . American English informal a ↑ cockroach
2 . a type of European fish
3 . informal the end part of a ↑ marijuana cigarette that has been smoked