- a phylum of worms having bilateral symmetry and a soft, usually flattened body, comprising the flatworms.
Origin of Platyhelminthes
1900–05; < New Latin (plural); see platyhelminth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- A phylum of flatworms having a flat, bilaterally symmetric body and no body cavity and including the tapeworms and flukes.