1570s, "emit semen," from L. ejaculatus, pp. of ejaculari, from ex- "out" + jaculari "to throw, dart," from jaculum "javelin," from jacere "to throw." Only other surviving sense is "exclaim suddenly" (1660s). Related: Ejaculated; ejaculating.
ejaculate e·jac·u·late (ĭ-jāk'yə-lāt') v.e·jac·u·lat·ed, e·jac·u·lat·ing, e·jac·u·lates To eject or discharge abruptly, especially to discharge semen in orgasm. n. (ĭ-jāk'yə-lĭt) Semen ejaculated in orgasm.