Spectrum
来自Big Physics
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early 17th century (in the sense ‘spectre’): from Latin, literally ‘image, apparition’, from specere ‘to look’.
wiktionary
From Latin spectrum(“appearance, image, apparition”), from speciō(“look at, view”). Doublet of specter. See also scope.
etymonline
spectrum (n.)
1610s, "apparition, specter," from Latin spectrum (plural spectra) "an appearance, image, apparition, specter," from specere "to look at, view" (from PIE root *spek- "to observe"). Meaning "visible band showing the successive colors, formed from a beam of light passed through a prism" first recorded 1670s. Figurative sense of "entire range (of something)" is from 1936.
