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exo-
[exo- 词源字典]
word-forming element meaning "outer, outside, outer part" used from mid-19c. in scientific words (such as
exoskeleton
), from Greek
exo
"outside," related to
ex
"out of" (see
ex-
).
[exo- etymology, exo- origin, 英语词源]
[exo- 词源字典]