from The American Heritage® Dictionary of the English Language, 4th Edition
- Idea: ideography.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- Forming compound words having the sense of "idea, image".
from the GNU version of the Collaborative International Dictionary of English
- A combining form from the Gr. �, an idea.
French idéo-, from Greek idea, form, idea; see weid- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
Representing a combining form of Ancient Greek ἰδέα ("form, semblance"). (Wiktionary)