Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
formuinethar
←
Proto-Indo-European
*men-
(root)
←
Old Irish
for
(prefix)
←
Old Irish
muinethar
(prefix)