Roach

• POS: Noun

CIDE DICTIONARY

Roach, n. 

 A cockroach.  [1913 Webster]

Roach, n. [OE. rroche; cf. AS. reohha, D. rog, roch, G. roche, LG. ruche, Dan. rokke ray, Sw. rocka, and E. ray a fish.].

•  A European fresh-water fish of the Carp family (Leuciscus rutilus). It is silver-white, with a greenish back.  [1913 Webster]
•  A convex curve or arch cut in the edge of a sail to prevent chafing, or to secure a better fit.  [1913 Webster]

As sound as a roach [roach perhaps being a corruption of a F. roche a rock], perfectly sound.

Roach, v. t. 

•  To cause to arch.  [1913 Webster]
•  To cut off, as a horse's mane, so that the part left shall stand upright.  [1913 Webster]

OXFORD DICTIONARY

Roach, n. (pl. same) a small freshwater fish, esp. Rutilus rutilus, allied to the carp.

Roach, n.
1 US colloq. a cockroach.
2 sl. the butt of a marijuana cigarette.

Roach, n. Naut. an upward curve in the foot of a square sail.

Etymology

18th c.: orig. unkn.

THESAURUS

Roach

DET, DMT, LSD, Mary Jane, STP, THC, acid, afterglow, afterimage, antidepressant, ataractic, balance, butt, butt end, candle ends, cat flea, chaff, chigoe, cockroach, crab, debris, detritus, diethyltryptamine, dimethyltryptamine, dog flea, end, fag end, filings, flea, fossil, gage, ganja, grass, grayback, hallucinogen, hash, hashish, hay, hemp, holdover, husks, jigger, joint, kava, leavings, leftovers, louse, marijuana, mescal, mescal bean, mescal button, mescaline, mind-altering drug, mind-blowing drug, mind-expanding drug, mite, morning glory seeds, nit, odds and ends, offscourings, orts, parasite, parings, peyote, pot, psilocin, psilocybin, psychedelic, psychic energizer, psychoactive drug, psychochemical, psychotomimetic, rags, red bug, reefer, refuse, relics, remainder, remains, remnant, residue, residuum, rest, rubbish, ruins, rump, sand flea, sawdust, scourings, scraps, shadow, shavings, stick, straw, stubble, stump, survival, sweepings, tea, trace, tranquilizer, vermin, vestige, waste, weed, weevil