cloud(пролегающая между людьми и омрачающая их отношения; Marx' inadequate response to the news of the death of Mary Burns, Engels' first wife, raised a little cloud in their relations. I. Havkin); trace of sadness, doubt, etc. on one’s face; grain; particle(of truth); ghost
shadow(японской свечи • The area between the open and the close is called the real body, price excursions above and below the real body are shadows (also called wicks)...The price range is the distance between the top of the upper shadow and the bottom of the lower shadow moved through during the time frame of the candlestickAlexander Oshis)
empty particle(капсид бактериофага, не содержащий нуклеиновой кислоты, либо опустевшая оболочка клетки dimock); ghost(капсид бактериофага, не содержащий нуклеиновой кислоты, либо опустевшая оболочка клетки dimock)