[1] : WordNet (r) 2.0

vicious circle
     n 1: one trouble leads to another that aggravates the first syn:
           vicious cycle
     2: an argument that assumes that which is to be proved
see also:
vicious cycle 

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

109 moby thesaurus words for "vicious circle":
   absurdity, aimlessness, annular muscle, annulus,
   apparent soundness, areola, aureole, bootlessness, casuistry,
   chain of circumstances, chain reaction, chaplet,
   chapter of accidents, circle, circuit, circularity, circumference,
   circus, closed circle, concatenation of events, corona, coronet,
   crown, cycle, diadem, discus, disingenuousness, disk, distortion,
   emptiness, equivocalness, equivocation, eternal return,
   evasive reasoning, fairy ring, fallaciousness, fallacy, fatuity,
   feast and famine, fecklessness, fruitlessness, futility, garland,
   glory, halo, hollowness, impotence, inanity, ineffectiveness,
   ineffectuality, inefficacy, ins and outs, insincerity, jesuitism,
   jesuitry, lasso, logical circle, loop, looplet, magic circle,
   meaninglessness, misapplication, mystification, noose, nugacity,
   obfuscation, obscurantism, orbit, otiosity, oversubtlety,
   perversion, philosophism, plausibility, plausibleness,
   pointlessness, profitlessness, purposelessness, radius, rat race,
   rationalization, ring, rondelle, round, roundel, saucer, sophism,
   sophistical reasoning, sophistication, sophistry, special pleading,
   speciosity, specious reasoning, speciousness, sphincter, subtlety,
   the absurd, triviality, unproductiveness, unprofitability,
   unprofitableness, ups and downs, valuelessness, vanity,
   vicious reasoning, vicissitudes, vicissitudes of fortune, wheel,
   worthlessness, wreath

Vicious Circle >> V Words
Vicious Circle, definition of term: Vicious Circle
vicious+circle_pag1.html

Vicious >> V Words
Vicious, definition of term: Vicious
vicious_pag1.html

Circle >> C Words
Circle, definition of term: Circle
circle_pag1.html

Circle Round >> C Words
Circle Round, definition of term: Circle Round
circle+round_pag1.html

Vicious Cycle >> V Words
Vicious Cycle, definition of term: Vicious Cycle
vicious+cycle_pag1.html

Traffic Circle >> T Words
Traffic Circle, definition of term: Traffic Circle
traffic+circle_pag1.html

Great Circle >> G Words
Great Circle, definition of term: Great Circle
great+circle_pag1.html

Family Circle >> F Words
Family Circle, definition of term: Family Circle
family+circle_pag1.html

Arctic Circle >> A Words
Arctic Circle, definition of term: Arctic Circle
arctic+circle_pag1.html

Pitch Circle >> P Words
Pitch Circle, definition of term: Pitch Circle
pitch+circle_pag1.html