prep. prefix forming compounds with nouns, adjj.
and verbs, leniting. For the O. Ir. forms see
. In later lang. aith- is usual before palatals, ath-
before non-palatals. Before following dentals delenition took
place (for the phonetics cf.
GOI § 148
Introd. § 49
), and the resulting consonant was voiceless even
when the second element began with d- (the phonetic form is
somet. obscured by etymological spellings). See aithtinól,
aithTemair, ? attain, attochomlad, attoga, attoísech, attráchtad; aitdelb, aitdénam, aithdliged, aitdebaid, attá(i)l, atdánaigthe, etc. With verbs and verbal nouns corresponds in
sense to Latin re-, with nouns second, a further, with nouns
indicating persons ex- (as in aithrí deposed king), worn out,
degenerate. Freq. with merely intensive force.