Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
ath-
←
Proto-Celtic
*ati-
(inherited)
←
Old Irish
[[aith-]], [[ath-]]
(inherited)
→
Scottish Gaelic
ath-nuadhachail
(affix)
→
Scottish Gaelic
ath-ghnàthach
(affix)
→
Scottish Gaelic
ath-bhriathrach
(affix)
→
Scottish Gaelic
ath-fhilleadh
(affix)
→
Scottish Gaelic
ath-fhillteach
(affix)
→
Scottish Gaelic
ath-shèideach
(affix)