From Middle English from words borrowed from Middle French; from Latin ex (“out of, from”), from Proto-Indo-European *eǵ-, *eǵs- (“out”), *eǵʰs. Cognate with Ancient Greek ἐξ (eks, “out of, from”), Transalpine Gaulish ex- (“out”), Old Irish ess- (“out”), Old Church Slavonic изу (izu, “out”), Russian из (iz, “from, out of”).
- out of
- former, but still living (almost always used with a hyphen)
- (biology) Lacking.
- Sometimes the x in ex- is elided before certain constants, being reduced to e- (as, e.g., in ejaculate).
- ex- (former)