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

worm \worm\ w^urm, n. oe. worm, wurm, as. wyrm; akin to d.
   worm, os.  g. wurm, icel. ormr, sw.  dan. orm, goth.
   wa'urms, l. vermis, gr. ? a wood worm. cf. vermicelli,
   vermilion, vermin.
   1913 webster
   1. a creeping or a crawling animal of any kind or size, as a
      serpent, caterpillar, snail, or the like. archaic
      1913 webster

            there came a viper out of the heat, and leapt on his
            hand. when the men of the country saw the worm hang
            on his hand, they said, this man must needs be a
            murderer.                             --tyndale
                                                  acts xxviii.
                                                  3, 4.
      1913 webster

            't is slander,
            whose edge is sharper than the sword, whose tongue
            outvenoms all the worms of nile.      --shak.
      1913 webster

            when cerberus perceived us, the great worm,
            his mouth he opened and displayed his tusks.
                                                  --longfellow.
      1913 webster

   2. any small creeping animal or reptile, either entirely
      without feet, or with very short ones, including a great
      variety of animals; as, an earthworm; the blindworm.
      specifically: zool.
      a any helminth; an entozoon.
      b any annelid.
      c an insect larva.
      d pl. same as vermes.
          1913 webster

   3. an internal tormentor; something that gnaws or afflicts
      one's mind with remorse.
      1913 webster

            the worm of conscience still begnaw thy soul
                                                  --shak.
      1913 webster

   4. a being debased and despised.
      1913 webster

            i am a worm, and no man.              --ps. xxii. 6.
      1913 webster

   5. anything spiral, vermiculated, or resembling a worm; as:
      a the thread of a screw.
          1913 webster

                the threads of screws, when bigger than can be
                made in screw plates, are called worms. --moxon.
          1913 webster
      b a spiral instrument or screw, often like a double
          corkscrew, used for drawing balls from firearms.
      c anat. a certain muscular band in the tongue of some
          animals, as the dog; the lytta. see lytta.
      d the condensing tube of a still, often curved and wound
          to economize space. see illust. of still.
      e mach. a short revolving screw, the threads of which
          drive, or are driven by, a worm wheel by gearing into
          its teeth or cogs. see illust. of worm gearing,
          below.
          1913 webster

   worm abscess med., an abscess produced by the irritation
      resulting from the lodgment of a worm in some part of the
      body.

   worm fence. see under fence.

   worm gear. mach.
      a a worm wheel.
      b worm gearing.

   worm gearing, gearing consisting of a worm and worm wheel
      working together.

   worm grass. bot.
      a see pinkroot, 2
      a .
      b the white stonecrop sedum album reputed to have
          qualities as a vermifuge. --dr. prior.

   worm oil med., an anthelmintic consisting of oil obtained
      from the seeds of chenopodium anthelminticum.

   worm powder med., an anthelmintic powder.

   worm snake. zool. see thunder snake
      b, under thunder.

   worm tea med., an anthelmintic tea or tisane.

   worm tincture med., a tincture prepared from dried
      earthworms, oil of tartar, spirit of wine, etc. obs.

   worm wheel, a cogwheel having teeth formed to fit into the
      spiral spaces of a screw called a worm, so that the wheel
      may be turned by, or may turn, the worm; -- called also
      worm gear, and sometimes tangent wheel. see illust. of
      worm gearing, above.
      1913 webster
      1913 webster
see also:
vermicelli vermilion vermin vermes lytta still 
worm gearing worm abscess worm fence fence worm gear 
worm grass pinkroot sedum album worm oil chenopodium anthelminticum 
worm powder worm snake thunder snake thunder worm tea 
worm tincture worm wheel worm gear tangent wheel 

[2] : WordNet (r) 2.0

worm wheel
     n : gear with the thread of a worm

Fifth Wheel >> F Words
Fifth Wheel, definition of term: Fifth Wheel
fifth+wheel_pag1.html

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

Gear Wheel >> G Words
Gear Wheel, definition of term: Gear Wheel
gear+wheel_pag1.html

Guinea Worm >> G Words
Guinea Worm, definition of term: Guinea Worm
guinea+worm_pag1.html

Ferris Wheel >> F Words
Ferris Wheel, definition of term: Ferris Wheel
ferris+wheel_pag1.html

Driving Wheel >> D Words
Driving Wheel, definition of term: Driving Wheel
driving+wheel_pag1.html

Catherine Wheel >> C Words
Catherine Wheel, definition of term: Catherine Wheel
catherine+wheel_pag1.html

Color Wheel >> C Words
Color Wheel, definition of term: Color Wheel
color+wheel_pag1.html

Daisy Wheel >> D Words
Daisy Wheel, definition of term: Daisy Wheel
daisy+wheel_pag1.html

Big Wheel >> B Words
Big Wheel, definition of term: Big Wheel
big+wheel_pag1.html