roundworm

noun

round·​worm ˈrau̇nd-ˌwərm 

: nematode

also : a related round-bodied unsegmented worm (such as a spiny-headed worm) as distinguished from a flatworm

Examples of roundworm in a Sentence

Recent Examples on the Web

Industry reaction Chlorpyrifos is used to control different kinds of pests, like termites, mosquitoes and roundworms, among crops, according to the National Pesticide Information Center (NPIC) at Oregon State University. —Angelica Stabile, FOXNews.com, 23 Mar. 2026

In addition, raccoon feces may contain Baylisascaris roundworm eggs, which can infect humans and lead to nerve damage or blindness. —Arricca Elin Sansone, Southern Living, 16 Mar. 2026

In 2024, two children in the South Bay were infected with raccoon roundworm. —Amy Corral, CBS News, 4 Mar. 2026

The kinds of intestinal worms that dogs can get are most commonly roundworm, hookworm, whipworm, and tapeworm. —Dr. John De Jong, Boston Herald, 18 Jan. 2026

Word History

First Known Use

1558, in the meaning defined above

Kids Definition

roundworm

noun

round·​worm ˈrau̇n-ˌdwərm 

: a nematode worm (as a hookworm)

also : a related round-bodied worm without segments as compared to a flatworm

Medical Definition

roundworm

noun

round·​worm ˈrau̇n-ˌdwərm 

: nematode

also : a related round-bodied unsegmented worm (as an acanthocephalan) as distinguished from a flatworm