Englishabsorption spectrum /əbˈzôrpSHən, , əbˈzɔrpʃən, abˈzôrpSHən, , æbˈzɔrpʃən, əbˈsôrpSHən, , əbˈsɔrpʃən, abˈsôrpSHən ˈspektrəm, æbˈsɔrpʃən ˈspɛktrəm/
▸ noun Physics a spectrum of electromagnetic radiation transmitted through a substance, showing dark lines or bands due to absorption of specific wavelengths. Compare with emission spectrum.