etiological

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 *-ikos
Proto-Italic *-ikos
Latin -icuslbor.
Old French -iquebor.
Middle English -ic
Proto-Indo-European *h₂el-der.?
Proto-Italic *-ālis
Latin -ālisbor.
Old French -albor.
▲
Latin -ālis
Old French -elbor.
▲
Latin -ālisbor.
Middle English -al
Middle English -ical
English -ical
English etiological
From etiology + -ical. By surface analysis, etio- + -logical.