bombard (v.)youdaoicibaDictYouDict[bombard 词源字典]
1590s, from French bombarder, from bombarde "mortar, catapult" (see bombard (n.)). Figurative sense by 1765. Related: Bombarded; bombarding.[bombard etymology, bombard origin, 英语词源]
californiumyoudaoicibaDictYouDict
"The chemical element of atomic number 98, a radioactive metal of the actinide series, first produced by bombarding curium with helium ions", 1950s: named after California University (where it was first made) + -ium.
americiumyoudaoicibaDictYouDict
"The chemical element of atomic number 95, a radioactive metal of the actinide series. Americium does not occur naturally and was first made by bombarding plutonium with neutrons", 1940s: from America (where it was first made) + -ium.
berkeliumyoudaoicibaDictYouDict
"The chemical element of atomic number 97, a radioactive metal of the actinide series. Berkelium does not occur naturally and was first made by bombarding americium with helium ions", 1949: from Berkeley (where it was first made) + -ium.