Answer
ecto-outer
Work Step by Step
The prefix,ecto, means outer.An example of a word with this prefix is ectoderm which is an outer layer that gives rise to the epidermis and nervous system.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.