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Definition of flatworm

flatworm

/ˈflæt.wɜːrm/
flat · worm
Plural:flatworms
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flatworm Lexical Profile

flatworm Game Scores & Validity

• noun

1

Any invertebrate of the phylum Platyhelminthes, characterized by a soft, unsegmented, bilaterally symmetrical, and dorsoventrally flattened body lacking circulatory and respiratory systems, commonly found in aquatic environments or as parasites.

Example

"In biology class, the students observed a freshwater flatworm under the microscope to study its remarkable ability to regenerate severed body parts."

Synonyms
View all synonyms for flatworm

• Rhymes for flatworm

• Nearby Words

flatulence
flatulent
flatware
flatworm
flaunt
flaunter
flaunty

Word Origin & Etymology

A transparent compound of 'flat' and 'worm', coined in the 19th century to describe the characteristic dorsoventrally flattened body shape of organisms belonging to the phylum Platyhelminthes.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Flatworm. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/flatworm
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