Platyhelminth

Part of speech: noun

Definitions

1. A phylum of soft-bodied invertebrates characterized by a flat body structure, commonly known as flatworms, which may be free-living or parasitic
2. An assemblage of organisms with bilateral symmetry and a flattened form that includes various species such as planarians, flukes, and tapeworms
3. An important group of non-segmented worms exhibiting a flat morphology, often significant in both ecological roles and as parasites in other animals

Etymology: The name reads like a Greek compound, and it is one: "platys" means "flat" and "helminthes" means "worms," so the whole term means "flat worms." It was coined as the taxonomic name of the group, and the English noun was borrowed directly from that scientific Latin name, Platyhelminthes, rather than arising in everyday speech. Because it is a technical coinage, the word has no history as a common term. Its meaning is fixed by the classification it names: the phylum covers flatworms, from the free-living planarians to parasites such as tapeworms and flukes. The Greek roots describe the body plan directly, which is why the name has stayed transparent to anyone who knows a little Greek.

Synonyms: flatworm