• WordNet 3.6
    • n roundworm unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic
    • n roundworm infections of the skin or nails caused by fungi and appearing as itching circular patches
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Webster's Revised Unabridged Dictionary
    • n Roundworm (Zoöl) A nematoid worm.
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Century Dictionary and Cyclopedia
    • n roundworm An intestinal parasitic worm, Ascaris lumbricoides, several inches long, infesting the human intestine: distinguished from the similar but much smaller pinworms or threadworms, and from the larger and more formidable flatworms, jointworms, or tapes.
    • n roundworm Hence Any member of the class Nematelmintha; a nematoid worm: distinguished from cestoid and trematoid worms, or tapeworms and flukes.
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In literature:

Both the small and large Roundworms infest the intestines of cattle and calves.
"The Veterinarian" by Chas. J. Korinek
Roundworms very much resemble earthworms in shape and color.
"The Mother and Her Child" by William S. Sadler
Roundworms, or nematodes, constitute the most important group of parasitic worms in the horse.
"Special Report on Diseases of the Horse" by United States Department of Agriculture
Parasitic roundworms attack certain species.
"Insects and Diseases" by Rennie W. Doane
Several species of roundworms may occur in the fourth stomach.
"Special Report on Diseases of Cattle" by U.S. Department of Agriculture
Roundworms probably were parasites, rather than food.
"Geographic Variation in the North American Cyprinid Fish, Hybopsis gracilis" by Leonard J. Olund
The roundworms are slender, smooth, cylindrical worms pointed at both ends.
"Elementary Zoology, Second Edition" by Vernon L. Kellogg

In poetry:

Breakers heaved up with darkness, serpents, eels,
And in the swarm, fanatical roundworms
Pursue you: May victory and struggle cast you down
Since you breached the storm with your brow.
"The Sea-Beast" by Tudor Arghezi

In news:

Found in the tropical savannas of Brazil, Philcoxia minensis uses its sticky underground leaves to trap tiny roundworms.
Dog Roundworm Transmission Rates to Humans.
The roundworm even gets withdrawal symptoms when it goes cold turkey.
A new study suggests that in the laboratory roundworm, and maybe people too, youthfulness is maintained by hormonal signals from the brain.