ecopsychological

Etymology tree
Proto-Indo-European *weyḱ-
Proto-Indo-European *-os
Proto-Indo-European *wóyḱos
Proto-Hellenic *wóikos
Ancient Greek οἶκος (oîkos)
Latin oeco-
French éco-
English eco-
English psychology
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 psychological
English ecopsychological
From eco- + psychological.