IPA: /ˌmʌltiˈspɛktrəl/
KK: /mʌltiˈspɛktrəl/
Relating to or using multiple ranges of wavelengths or frequencies, especially in the context of light or electromagnetic radiation.
The multispectral imaging system can capture images in several different wavelengths.
Multispectral → It is formed from "multi-" (meaning many) and "spectrum" (from Latin *spectrum*, meaning appearance or image). The word "multispectral" refers to something that involves many different wavelengths of light or colors.
Think of 'many' ('multi-') different 'appearances' or 'images' ('spectrum') — that's what multispectral means.
No commonly confused words.