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T, the seventeenth letter of the Irish alphabet, and in the
Ogham alphabet the third letter in the second or h- group,
IGT Introd. § 4 . Irish nametinne `holly' : tinne ... .i.
cuileann, Auraic. 1180 . Note alsotrían .i. aill inde sin
5aniu` trian, t, another thing the meaning of that today,'
5549 .
Frequ. writtenttin O. and Mid. Ir. (cf. KZ xxxvi 202 ff. ).
The groupstis somet. writtensdin Mid. and Mod. Ir.
Lenitedthis somet. confused withch:tothlugud, ZCP
10 iii 35.12 =tochlugadh, Études Celt. ii 298.10 .t'eichsi,
teithsi v.l., IGT Decl. ex. 998 .chreich,chreith,v.l. ex.
1001 .Cf. sethnulatersechnóin, ZCP xii 287 , and IGT
Introd. 22.26 .
In O. and Mid. Irisht(t), when initial or preceded bys,
15always represents voicelesst. In other positions it may
also represent voicedd. In O. Ir. this value oftis regular
after vowels (cét, mod.céad), optional after consonants.
See Thurn. Hdb. § 29 - §30 .
Lenition oftis regularly marked in MSS. of all periods.
20The pronunciation ofthashdates ( Thurn. Hdb. § 119 )
from the 11th century, but according to O'Rahilly, Her-
mathena xliv 163 ff. , from the end of the 13th. Previous
to this we must suppose a dental spirant of the type of Ger-
manic þ.thalso occasionally alternates withf(pron. h) :
25 othrála(ofrála), ZCP vi 24 z ,cf. cona fuigsin (thuigsin),
Études Celt. i 274.22 , and Mod. Ir.tathaint(—f—). In the
possessive2 s.(seeit) it is sometimes replaced by h— :
h'anora, ZCP vi 81.19 . tresists or loses lenition : (a) When
geminated (seeinfra). (b) In the groupsst,rt(but fre-
30quently—rth—in part., see Thurn. Hdb. § 714 ),lt,cht. (c) In
common withd, after finalnof a preceding word. (d) Fre-
quently before initials- of a closely-following word :in
chrut-so, —sin, Sg. 211b4 , 63a14 .in slogattsa, LL 398a18 .
Note alsofáitsine`prophecy,' Wb 30d23 , in Mlfáissine
35 fáithsine,q.v.See also IGT Introd. § 33 , § 34 . (e) When
a geminated sound results from contact ofthandthordh:
-mitter<*mid-ther,indnite<*ind-nith-the. See Thurn.
Hdb. § 134 , Meyer ZCP xiii 191.
Nasalisation oftis seldom marked in Old and Middle
40Irish, but note occasional spellings likecon·danicc, Wb 3c27 ,
besidecon·tanic, 3a1 , and the stereotypedoldaas(taas).
The spellingttis found occasionally in O. Ir., more fre-
quently in Mid. Ir. In Mod. Ir. nasalisation is marked by a
prefixedd-.Cf. and trí naraid their three charioteers,
45 TBC² 804 . See Ériu xi 148 - 9 .
tfrequently results from originaldin contact with lenited
ṡ:díltud<*dí-ṡlonduth, Thurn. Hdb. § 128 .intamail
<*indṡamail,int ṡúil,int ṡaeguil. This has given rise to the
prefixing of t (where etymologically unjustifiable) as a
50sign of lenition :rochōirigh a tsleg re thaeb, ZCP xiii 220.1 .
tainic crich tsaogail, TTebe 3718 ,dar mullach tsleibi Par-
nars, 3714 . Note also :astsruth, SR 1665 .istsruth,
1682 .riastṡluag, 2129 . See IGT Introd. 17.19 .tharises
fromdh+h(<ṡ) inmiathamla<miad+ṡamail, see Ped.
55 i 408 .t<dhafter l, n, is found inrélto(gs. ofrélad).ingan-
tach(ingnad),etc., Ped. i 417 . Also after voiceless sounds :
macthi, Wb 12c9 (—de), though in such cases etymological
considerations often cause the originaldto be restored :
mucde suinus, Sg. 37b9 ,cf. Thurn. Hdb. § 121 . There are
60also some cases ofthforddue, apparently, to variations in
pronunciation,e.g. búaith(—d), Wb 11a7 .díthnad, 14b15
(do-dona), more usuallydídnad.talso represents the
voiceddarising from *nt, *mtin words likecotlud<con-
tuil,cét<*kṃtom etc., and the voicelesstfrom k+d in
65 etlae<*ek(s)dāl-,etc.
In loanwordstrepresents W.t, th, dd(exx. Ped. i 23 ,
24 , 509 ), Lat.t, tt( Ped. i 231 , 4 ). Also W.t=d( Ped. i 24 ),
and intervocalic and final Lat.tin words borrowed through
W. ( Ped. i 232 , 3 ).

70 1 t pronForm of the poss. adj.2 s.(seedo) with vowel elided before
nouns beginning with vowles and lenitedfbefore a vowel :
tortachtae, Ml 108a1 .tesérge, Thes. ii 242.4 .t'aiccept, Fél.
12.19 .t'ordan, Prol. 276 .t'intliocht, SR 1328 .th'(ḟ)or-
fáiltius, CRR 18 .bhar th'(ḟ)oesam, 40 .dásacht t'fheirge,
75 TSh. 4210 .th'easgcaraid, 1064 .h'anora, ZCP vi 81.19 .

2 t pronForm of poss. adj.2 s.(seedo) used after prepositions
ending in vowels :dit gnímaib, Wb 31c8 .dot edbartaib,
Ml 45b6 .dot brecad-sa, PH 3836 .dot aire, TSh. 3185 .
let mháthair, let athair, let toide, SG 214.36 . Also in the
later language after prepositions ending in consonants
with intervening secondary vowel :ocut iarraid, PH 2605 .
5 agod dhíorghadh, TSh. 2632 , earlierac du(Ml).