Specter
来自Big Physics
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early 17th century: from French spectre or Latin spectrum (see spectrum).
wiktionary
From French spectre, from Latin spectrum(“appearance, apparition”). Doublet of spectrum.
etymonline
specter (n.)
c. 1600, "frightening ghost," from French spectre "an image, figure, ghost" (16c.), from Latin spectrum "appearance, vision, apparition" (see spectrum). Figurative sense "object of dread" is from 1774.
