- (literary)
like a ghost; connected with a ghost 鬼一般的；幽灵似的；鬼的；幽灵的 a spectral figure 鬼影
- (specialist)
connected with a spectrum 谱的；光谱的；频谱的 spectral bands 光谱带 the full spectral range 全光谱范围
Word Originsense 1 early 19th cent.: from spectre + -al.sense 2 mid 19th cent.: from spectrum + -al.