The Collaborative International Dictionary of English v.0.48:

Rasp \Rasp\ (r[.a]sp), v. t. [imp. & p. p. Rasped (r[.a]spt);
   p. pr. & vb. n. Rasping.] [OF. rasper, F. r[^a]per, to
   scrape, grate, rasp, fr. OHG. rasp[=o]n to scrape together,
   to collect, probably akin to E. rap. Cf. Rap to snatch.]
   [1913 Webster]
   1. To rub or file with a rasp; to rub or grate with a rough
      file; as, to rasp wood to make it smooth; to rasp bones to
      powder.
      [1913 Webster]

   2. Hence, figuratively: To grate harshly upon; to offend by
      coarse or rough treatment or language; as, some sounds
      rasp the ear; his insults rasped my temper.
      [1913 Webster]

WordNet (r) 3.0 (2006):

rasping
    adj 1: unpleasantly harsh or grating in sound; "a gravelly
           voice" [syn: grating, gravelly, rasping, raspy,
           rough, scratchy]
    n 1: uttering in an irritated tone [syn: rasp, rasping]

Moby Thesaurus II by Grady Ward, 1.0:

119 Moby Thesaurus words for "rasping":
   ablation, ablative, abradant, abrasion, abrasive, air pollution,
   attrition, attritive, attritus, bones, bran, buffing, burnishing,
   chafe, chaff, chafing, cosmic dust, crumb, crumble, culm, deadwood,
   detrition, dishwater, draff, dregs, dressing, dry, dust, dust ball,
   efflorescence, erasure, erosion, erosive, fallout, farina, filing,
   filings, flour, fretting, galling, garbage, gash, gnawing, grating,
   grazing, grinding, grits, groats, hoarse, hogwash, husks, irritant,
   irritating, irritative, jangling, jangly, jarring, kittens,
   leavings, lees, limation, lint, meal, offal, offscourings, orts,
   parings, polishing, potsherds, powder, pussies, rags, raspings,
   raspy, raucous, refuse, rough, rubbing away, rugged, sandblasting,
   sanding, sawdust, scouring, scourings, scrap iron, scrape,
   scraping, scraps, scrapy, scratch, scratching, scratchy, scrub,
   scrubbing, scuff, scum, shards, shavings, shining, slack, slag,
   slop, slops, smoothing, smut, soot, stinging, stridulous, stubble,
   sweepings, swill, tares, wastage, waste, waste matter, wastepaper,
   wear, wearing away, weeds