[1] : The Collaborative International Dictionary of English v.0.48

retch \retch\ re^ch or r=ech; 277, v. i. imp.  p. p.
   retched re^cht; p. pr.  vb. n. retching. as.
   hraecan to clear the throat, hawk, fr. hraca throat; akin
   to g. rachen, and perhaps to e. rack neck.
   to make an effort to vomit; to strain, as in vomiting.
   written also reach.
   1913 webster

         beloved julia, hear me still beseeching
         here he grew inarticulate with retching. --byron.
   1913 webster
see also:
retched retching reach 

[2] : The Collaborative International Dictionary of English v.0.48

retch \retch\, v. t.  i. see reck.
   to care for; to heed; to reck. obs. --chaucer.
   1913 webster
see also:
reck 

[3] : WordNet (r) 2.0

retch
     n : an involuntary spasm of ineffectual vomiting; "a bad case of
         the heaves" syn: heave
     v 1: eject the contents of the stomach through the mouth; "after
          drinking too much, the students vomited"; "he purged
          continuously"; "the patient regurgitated the food we
          gave him last night" syn: vomit, vomit up, purge,
           cast, sick, cat, be sick, disgorge, regorge,
           puke, barf, spew, spue, chuck, upchuck, honk,
           regurgitate, throw up ant: keep down
     2: make an unsuccessful effort to vomit; strain to vomit syn:
        gag, heave
see also:
heave vomit vomit up purge cast sick 
cat be sick disgorge regorge puke 
barf spew spue chuck upchuck 
honk regurgitate throw up keep down gag 

[4] : Moby Thesaurus II by Grady Ward, 1.0

24 moby thesaurus words for "retch":
   barf, be nauseated, be seasick, be sick, bring up, choke on,
   chuck up, disgorge, egest, feed the fish, feel disgust, gag, heave,
   heave the gorge, keck, puke, regurgitate, reject, sick up,
   sicken at, spew, throw up, upchuck, vomit

Retch >> R Words
Retch, definition of term: Retch
retch_pag1.html