[often treated as sing.](chiefly Geology & Astronomy)material that is forced or thrown out, especially as a result of volcanic eruption, meteoritic impact, or stellar explosion (主地质,主天文)(尤指火山喷发、陨石撞击或恒星爆炸时的)喷出物,排出物
语源
late 19th cent.: from Latin, things thrown out', neuter plural of ejectus 'thrown out', from eicere (see eject)