different between spectrum vs spectrometry

English

Etymology

From Latin spectrum (“appearance, image, apparition”), from speci? (“look at, view”). Doublet of specter. See also scope.

Pronunciation

• (Canada, UK) IPA^(key): /?spekt??m/
• (US) IPA^(key): /?sp?kt(?)??m/
• Rhymes: -?kt??m

Noun

spectrum (plural spectra or spectrums)

1. A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
2. Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc. [from later 17th c.]
   • 2010 October 30, Jim Giles, Jammed!, in New Scientist,

     Current 3G technologies can send roughly 1 bit of data - a one or a zero - per second over each 1 Hz of spectrum that the operator owns.

3. (psychology, education) The autism spectrum.
4. (chemistry) The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
5. (mathematics, linear algebra) The set of eigenvalues of a matrix.
6. (mathematics, functional analysis) Of a bounded linear operator A, the set of scalar values ? such that the operator A—?I, where I denotes the identity operator, does not have a bounded inverse; intended as a generalisation of the linear algebra sense.
7. (abstract algebra, algebraic geometry) The set, denoted Spec(R), of all prime ideals of a given ring R, commonly augmented with a Zariski topology and considered as a topological space.

   Hyponym: Stone space

8. (obsolete) Specter, apparition. [from early 17th c.]
9. The image of something seen that persists after the eyes are closed.

Derived terms

• cepstrum
• light spectrum
• spectro-
• spectrum disorder
• political spectrum

Related terms

• spectral

Translations

Anagrams

• cepstrum, crumpets

Dutch

Etymology

From Latin spectrum (“appearance, image, apparition”), from speci? (“look at, view”).

Pronunciation

Noun

spectrum n (plural spectrums or spectra, diminutive spectrumpje n)

1. spectrum

Derived terms

• spectraal
• spectroscoop

Latin

Etymology

From spec(i?) (“look at, behold”) +? -trum. Confer with speculum.

Pronunciation

• (Classical) IPA^(key): /?spek.trum/, [?s?p?kt?????]
• (Ecclesiastical) IPA^(key): /?spek.trum/, [?sp?kt??um]

Noun

spectrum n (genitive spectr?); second declension

1. appearance, image
2. apparition, specter

Declension

Second-declension noun (neuter).

Related terms

• speci?
• specti?
• spect?

Descendants

• Catalan: espectre
• Dutch: spectrum
• English: spectre, specter; spectrum
• French: spectre
• German: Spektrum
• Irish: speictream
• Italian: spettro
• Portuguese: espectro
• Romanian: spectru
• Russian: ?????? (spektr)
• Spanish: espectro
• Swedish: spektrum

References

• spectrum in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• spectrum in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• spectrum in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
• spectrum in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette

English

Etymology

spectro- +? -metry

Noun

spectrometry (countable and uncountable, plural spectrometries)

1. (physics, analytical chemistry) The measurement of the wavelength of electromagnetic radiation, especially any of several techniques used to analyze the structure of molecules; the measurement of spectra of things other than radiation, such as the masses of molecules and their breakdown products

Derived terms

• mass spectrometry
• X-ray spectrometry

Related terms

• spectrometer

Translations

See also

• spectroscopy