Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
ditnid
←
Proto-Indo-European
*h₁em-
(root)
←
Middle Irish
díten
(mention)
←
Old Irish
dítiu
(derived)
←
Old Irish
do·eim
(mention)