| EXO | the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life |
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| EXO | outermost layer of the pericarp of fruits as the skin of a peach or grape |
| EXO | grammar |
| EXO | a guided anti-ship missile developed by the French government |
| EXO | flying fishes |
| EXO | of or relating to exocrine glands or their secretions |
| EXO | a gland that secretes externally through a duct |
| EXO | flat sea urchins |
| EXO | a farcical afterpiece in the ancient Roman theater |
| EXO | the outer germ layer that develops into skin and nervous tissue |
| EXO | the branch of dentistry dealing with extraction of teeth |
| EXO | of or relating to or involving exodontics |