The Collaborative International Dictionary
Spectrographically
Spectrograph \Spec"tro*graph\, n. [Spectrum + graph.] (Physics)
An apparatus for photographing or mapping a spectrum.
A photograph or picture of a spectrum. -- Spec`tro*graph"ic, a. -- Spec`tro*graph"ic*al*ly, adv. -- Spec*trog"ra*phy, n.
WordNet
spectrographically
adv. by spectrographic means; "the speech spectrum was displayed spectrographically"