from The American Heritage® Dictionary of the English Language, 4th Edition
- Inside; within: entoblast.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- Endo-; inside.
from the GNU version of the Collaborative International Dictionary of English
- A combining form signifying within.
from The Century Dictionary and Cyclopedia
- n. A prefix, chiefly used in biological terms, denoting ‘within, inside, inner, internal’: opposed to ecto- and exo-.
New Latin, from Greek entos, within; see en in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)