- any nematode, especially Ascaris lumbricoides, that infests the intestine of humans and other mammals.
Origin of roundworm
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- any nematode worm, esp Ascaris lumbricoides, a common intestinal parasite of man and pigs
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.