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espectral adj.
light.	spectral
metrol.	spectral density of ...; spectral concentration of ...

espectral: 97 phrases in 18 subjects

Antennas and waveguides	6
Communications	3
Earth sciences	4
Electronics	10
Environment	1
Health care	3
International Monetary Fund	1
Lighting other than cinema	34
Mathematics	10
Medical	2
Metrology	3
Physical sciences	1
Piezoelectric crystals	5
Radio	3
Radiology	1
Statistics	2
Transport	1
Vacuum tubes	7