Search Dictionary
Definition of flatworm

flatworm

/ˈflæt.wɜːrm/
flat · worm
Plural:flatworms
JUMP TO:

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

flatfish
flathead
flathead catfish
flatworm
flavor
flax
flaxseed

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 Oct 16, 2026, from https://wordmom.com/dictionary/flatworm
Wordmom is your complete guide to the English language. Whether you're looking up a definition, searching for the perfect synonym, or unscrambling letters for a word game, our comprehensive suite of tools is designed to help you find the right word, every time.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWords
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE®, Words With Friends®, Wordle®, and related game titles or tournament codes are registered trademarks of their respective owners (including Hasbro, Mattel, Zynga, The New York Times, NASPA, and WESPA). Wordmom is an independent reference utility for educational and entertainment purposes, not affiliated with, sponsored, or endorsed by these entities. All game names are referenced strictly under nominative fair use for compatibility.