etiologist

Etymology tree
Proto-Indo-European *h₂ey-der.
Ancient Greek αἰτῐ́ᾱ (aitĭ́ā)
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 -λογίᾱ (-logíā)
Ancient Greek αἰτῐολογῐ́ᾱ (aitĭologĭ́ā)der.
Latin aetiologiabor.
English etiology
Proto-Indo-European *-id-
Proto-Indo-European *-yéti
Proto-Indo-European *-idyéti
Proto-Hellenic *-íďďō
Ancient Greek -ῐ́ζω (-ĭ́zō)
Proto-Hellenic *-tās
Ancient Greek -τής (-tḗs)
Ancient Greek -ῐστής (-ĭstḗs)bor.
Latin -istader.
Old French -istebor.
Middle English -ist
English -ist
English etiologist
From etiology + -ist. By surface analysis, etio- + -logist.