spectro-

specto (Latin)

I consider. I test. I watch, observe, look at, see.

-trum (Latin)

Forming instrument nouns.

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 [...]

spectro- (English)

Optical spectra.