cyanobacteriology

Etymology tree
Ancient Greek κῠ́ᾰνος (kŭ́ănos)
Ancient Greek -εος (-eos)
Ancient Greek κῠᾰ́νεος (kŭắneos)der.
English cyano-
Ancient Greek βακτηρία (baktēría)
Proto-Indo-European *-yósder.
Ancient Greek -ῐος (-ĭos)?
Ancient Greek -ιον (-ion)
Ancient Greek βακτήριον (baktḗrion)bor.
New Latin bactērium
Ancient Greek -ο- (-o-)der.
Latin -o-bor.
English -o-
English bacterio-
Proto-Indo-European *leǵ-
Ancient Greek λόγος (lógos)
Proto-Indo-European *-h₂
Proto-Indo-European *-éh₂
Proto-Indo-European *-i-eh₂
Proto-Hellenic *-íā
Ancient Greek -ῐ́ᾱ (-ĭ́ā)
Ancient Greek -λογῐ́ᾱ (-logĭ́ā)bor.
Latin -logialbor.
French -logiebor.
English -logy
English bacteriology
English cyanobacteriology
From cyano- + bacteriology.