from The American Heritage® Dictionary of the English Language, 4th Edition
- Flat: platyhelminth.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- Forms words referring to things that are relatively flat but wide, like a plateau. (opposed to lepto- flat but "thin", like a ribbon)
from the GNU version of the Collaborative International Dictionary of English
- A combining form from Gr. platy`s broad, wide, flat.
Greek platu-, from platus; see plat- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek πλατύς (platys, "flat") (Wiktionary)