- ecto-
[ecto- 词源字典]
- word-forming element generally meaning "outside, external," before vowels ect-, from Latinized form of Greek adverb ektos "outside, out of; free from; exempt" (opposed to entos), used to form compounds in Greek (such as ektome "a cutting out"); related to Greek ek, ex "out," from PIE *eghs "out" (see ex-).[ecto- etymology, ecto- origin, 英语词源]