any nematode, especially Ascaris lumbricoides, that infests the intestine of humans and other mammals.

1555–65; round1 + worm Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
roundworm (ˈraʊndˌwɜːm)
any nematode worm, esp Ascaris lumbricoides, a common intestinal parasite of man and pigs

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

roundworm round·worm (round'wûrm')
See nematode.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Tens of thousands of roundworm species are known, and the true number could be in the millions.
Common nematode parasites include roundworm and ringworm.
Ascariasis is caused by consuming food or drink contaminated with roundworm eggs.
Studying the nervous system of the roundworm is a promising approach for understanding the human brain.
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