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

caddis fly \caddis fly\, caddisfly \caddisfly\n.
   same as caddice fly.

   syn: caddice fly, caddicefly.
        wordnet 1.5
see also:
caddice fly 

[2] : WordNet (r) 2.0

caddis fly
     n : small moth-like insect having two pairs of hairy membranous
         wings and aquatic larvae syn: caddis-fly, caddice fly,
          caddice-fly
see also:
caddis-fly caddice fly caddice-fly 

Caddis Fly >> C Words
Caddis Fly, definition of term: Caddis Fly
caddis+fly_pag1.html

Caddis >> C Words
Caddis, definition of term: Caddis
caddis_pag1.html

Fly >> F Words
Fly, definition of term: Fly
fly_pag1.html

Fly Over >> F Words
Fly Over, definition of term: Fly Over
fly+over_pag1.html

Fly Wheel >> F Words
Fly Wheel, definition of term: Fly Wheel
fly+wheel_pag1.html

Fly Open >> F Words
Fly Open, definition of term: Fly Open
fly+open_pag1.html

Fly Agaric >> F Words
Fly Agaric, definition of term: Fly Agaric
fly+agaric_pag1.html

Fly Fishing >> F Words
Fly Fishing, definition of term: Fly Fishing
fly+fishing_pag1.html

Fly Ash >> F Words
Fly Ash, definition of term: Fly Ash
fly+ash_pag1.html

Dragon Fly >> D Words
Dragon Fly, definition of term: Dragon Fly
dragon+fly_pag1.html