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English word spectrum comes from Proto-Indo-European *speḱ-, Proto-Indo-European - -yeti, and later Proto-Indo-European *spéḱyeti (To be looking at, to keep looking at.)
*speḱ- (Proto-Indo-European)
to look
- -yeti (Proto-Indo-European)
*spéḱyeti (Proto-Indo-European)
To be looking at, to keep looking at.
*spekjō (Proto-Italic)
To observe, to see.
specio (Latin)
I observe, watch, look at.
spectrum (Latin)
Apparition, specter. Appearance, image.
spectrum (English)
(chemistry) The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).. (mathematics, functional analysis) Of a bounded linear operator A, the set of scalar values λ such that the operator A—λI, where I denotes the identity operator, does not have a bounded inverse; intended as a generalisation of the linear [...]