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roundworm

[round-wurm]
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noun
  1. any nematode, especially Ascaris lumbricoides, that infests the intestine of humans and other mammals.
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Origin of roundworm

First recorded in 1555–65; round1 + worm
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for roundworm

roundworm

noun
  1. any nematode worm, esp Ascaris lumbricoides, a common intestinal parasite of man and pigs
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

roundworm in Medicine

roundworm

(roundwûrm′)
n.
  1. nematode