Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
maoth
←
Proto-Celtic
*moytos
(inherited)
←
Proto-Indo-European
*meyh₁-
(derived)
←
Middle Irish
[[máeth]], [[móeth]]
(inherited)
←
Old Irish
moíth
(inherited)
→
Irish
maothán
(affix)