Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Occitan
olh
←
Proto-Indo-European
*h₃ekʷ-
(derived)
←
Latin
oculus
(inherited)
→
Catalan
ull
(inherited)
→
Occitan
uèlh
(inherited)
→
Occitan
uelh
(inherited)