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ejaculate [ejaculate 词源字典]: ejaculate: [16] Etymologically, ejaculate means ‘dart out’. It comes from Latin ejaculārī, a compound verb formed ultimately from the prefix ex- ‘out’ and jaculum ‘dart, javelin’. This in turn was a derivative of jacere ‘throw’ (which itself combined with ex- to form ejicere, source of English eject [15]). The word’s original sense ‘throw out suddenly’ survived (or perhaps has revived) for a time in English, but essentially it has been for its metaphorical uses (‘emit semen’ and ‘exclaim’) that it has been preserved.
=> eject, jesses, jet, object, reject, subject[ejaculate etymology, ejaculate origin, 英语词源]
ejaculate (v.): 1570s, "emit semen," from Latin eiaculatus, past participle of eiaculari "to throw out, shoot out," from ex- "out" (see ex-) + iaculari "to throw, hurl, cast, dart," from iaculum "javelin, dart," from iacere "to throw" (see jet (v.)). Sense of "exclaim suddenly" is from 1660s. Related: Ejaculated; ejaculating; ejaculatory.