Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Romanian
tihni
←
Proto-Slavic
*tixnǫti
(borrowed)
←
Proto-Slavic
*tixъ
(borrowed)
→
Romanian
tihnă
(back-formation)