幻影: an illusion, a vision; the image of something, such as in a memory or imagination; (medicine) a phantom, a phantasm: a perception of something that is not there

元号: An era name. / 減劫: (Buddhism) A process whereby human lifespans decline from 80,000 years to 10 years, decreasing by one year each year or each century. / 減号: The negative or minus sign. / 賢劫:

名言: witticism, golden words / 明言: clear and definite statement / 迷言: sayings that seem wise but are actually meaningless

現行犯: flagrante delicto, caught red-handed

原子時計: atomic clock (not to be confused with radio clock)

原子核: atomic nucleus

病原体: pathogen, causal agent of a disease

病原: cause or source of a disease, pathogenesis, etiology

原発: Short for 原子力発電所. nuclear power plant / 原発: Short for 原子力発電. nuclear power generation / 原発: (medicine) primary (e.g. primary tumor)

原書: original document, original work / 原初: source, first, original / 厳暑: extreme heat