spectrogoniometric

Etymology tree
Proto-Indo-European *speḱ-
Proto-Indo-European *-yeti
Proto-Indo-European *spéḱyeti
Proto-Italic *spekjō
Latin speciō
Proto-Indo-European *-tḗr
Proto-Indo-European *-trom
Proto-Italic *-trom
Latin -trum
Latin spectrumbor.
English spectrum
English spectro-
Proto-Indo-European *ǵónu
Proto-Hellenic *gónu
Ancient Greek γόνῠ (gónŭ)der.
Ancient Greek γωνίᾱ (gōníā)der.
English gonio-
Proto-Indo-European *meh₁-
▲
Proto-Indo-European *-trom
Proto-Hellenic *-tron
Ancient Greek -τρον (-tron)
Ancient Greek μέτρον (métron)der.
English -meter
English goniometer
Proto-Indo-European *-ikos
Proto-Italic *-ikos
Latin -icuslbor.
Old French -iquebor.
Middle English -ik
English -ic
English goniometric
English spectrogoniometric
From spectro- + goniometric.