S. long voiceless spirants shortened; [θθ|xx] > [θ|x]

@@@ but not [ff] medially, which was spelled “ph” as in ephel (LotR/1114)

Phonetic Rule Elements

[θθ] > [θ] ✧ VT47/14.2407 (þþ > þ); VT47/16.3912 (þþ > þ)
[xx] > [x]

Phonetic Rule Examples

roxx > rox xx > x rokkō > S. roch ✧ Let/282.1614
-aθθ > -aθ θθ > θ atta > S. -ath ✧ VT48/19.0411
aθθra- > aθra- θθ > θ atta- > S. athra ✧ PE17/014.3402

N. long voiceless spirants shortened; [ff|θθ|xx] > [f|θ|x]

GS/§4.184 @@@

Reference ✧ PE22/033.1908phonetics

Phonetic Rule Elements

[ff] > [f]
[θθ] > [θ]
[xx] > [x]

Phonetic Rule Examples

affarx > afarx ff > f ON. appharkha > N. afarch ✧ EtyAC/A.081
exx > ex xx > x ᴹ√EK > N. ech ✧ Ety/EK.039
exxad- > exad- xx > x ᴹ✶et-kat > N. echedi ✧ Ety/KAT.045
exxui > exui xx > x ᴹ✶et-kuiwē > N. echui(w) ✧ Ety/KUY.028
l̥oxx > l̥ox xx > x ᴹ✶lokko > N. lhoch ✧ Ety/LOKH.007
roxx > rox xx > x ᴹ✶rokkō > N. roch ✧ EtyAC/ROK.039
aθθ- > aθ- θθ > θ ᴹ√AT(AT) > N. ath- ✧ Ety/RAT.016-1
baθθa- > baθa- θθ > θ ON. batthṓ > N. batho ✧ Ety/BAT.023
bereθθ > bereθ θθ > θ ᴹ√MBER > N. bereth ✧ Ety/MBER.010
dalaθθ > dalaθ θθ > θ ᴹ√DAL > N. dalath ✧ Ety/DAL.020
daθθ > daθ θθ > θ ᴹ✶dattā > N. dath ✧ Ety/DAT.013
eθθir > eθir θθ > θ ᴹ✶etsiri > N. ethir ✧ Ety/ET.027
gaθθ > gaθ θθ > θ ᴹ✶gattā > N. gath ✧ Ety/GAT(H).003
groθθ > groθ θθ > θ ᴹ√ROT > N. roth/groth ✧ EtyAC/ROT.008
gwanaθθ > gwanaθ θθ > θ ᴹ√WAN > N. gwanath ✧ Ety/WAN.045
gwaθθ > gwaθ θθ > θ ON. watte > N. gwath ✧ Ety/WAƷ.033
gwaθθa- > gwaθa- θθ > θ ON. wattóbe > N. gwatho ✧ Ety/WAƷ.022
gwiliθθ > gwiliθ θθ > θ ᴹ√WIL > N. gwilith ✧ Ety/WIL.043
gwilwileθθ > gwilwileθ θθ > θ ᴹ√WIL > N. gwilwileth ✧ Ety/WIL.064
hadlaθθ > hadlaθ θθ > θ ᴹ√KHAT > hadlath > N. haglath ✧ Ety/KHAT.019
hadlaθθ > hadlaθ θθ > θ ᴹ√LATH/LAT > hadlath > N. haglath ✧ Ety/LATH.014
halaθθ > halaθ θθ > θ ᴹ√SKAL > N. ?halath ✧ EtyAC/SKEL.025
haθθel > haθel θθ > θ ᴹ✶syatsē̆la > N. hathel ✧ Ety/SYAD.066
helaθθ > helaθ θθ > θ ᴹ√SKEL > N. helath ✧ EtyAC/SKEL.070
heleθθ > heleθ θθ > θ ᴹ√SKEL > N. heleth ✧ Ety/SKEL.010
hoθθ > hoθ θθ > θ ᴹ✶khotsē > N. hoth ✧ Ety/KHOTH.006
jaθθ > jaθ θθ > θ ᴹ✶yatta > N. iath ✧ EtyAC/YAT.050
keleθθ > keleθ θθ > θ ᴹ√KEL > N. celeth ✧ EtyAC/KEL.015
koθθ > koθ θθ > θ ᴹ✶kotse > N. coth ✧ EtyAC/KOT.007
laθθ > laθ θθ > θ ᴹ√LATH/LAT > N. lhath ✧ Ety/LATH.008
liθθ > liθ θθ > θ ON. litthe > N. lith ✧ Ety/LIT.009
maθθa- > maθa- θθ > θ ON. matthṓ-be > N. matho ✧ Ety/MAƷ.043
meleθθ > meleθ θθ > θ ᴹ√MEL > N. meleth ✧ Ety/MEL.031
mereθθ > mereθ θθ > θ ᴹ√MER > N. mereth ✧ Ety/MBER.030
meθθ > meθ θθ > θ ᴹ✶metta > N. meth ✧ Ety/MET.010
boθθ > moθ θθ > θ ᴹ√MBOTH > N. both ✧ Ety/MBOTH.013
naneθθ > naneθ θθ > θ ᴹ√NAN > N. naneth ✧ Ety/NAN.006
n̥aθθ > n̥aθ θθ > θ ᴹ√SNAS/SNAT > N. naith ✧ Ety/SNAS.016
naθθ > naθ θθ > θ ᴹ√NAT > N. nath ✧ Ety/NAT.012
neθθ > neθ θθ > θ ᴹ√NETH > N. Neth ✧ Ety/NĪ¹.104
palaθθ > palaθ θθ > θ ᴹ√PAL > N. palath ✧ Ety/PAL.022
paθθ > paθ θθ > θ ON. pattha > N. path ✧ Ety/PATH.006
peθθ > peθ θθ > θ ᴹ✶kwetta > N. peth ✧ Ety/KWET.007
raθθ > raθ θθ > θ ON. rattha > N. rath ✧ Ety/RAT.034
seθθ > seθ θθ > θ ᴹ✶settā > N. seth ✧ EtyAC/SET.006
tiθθen > tiθen θθ > θ ᴹ√TIT > N. tithen ✧ Ety/TIT.007

G. long voiceless spirants shortened; [ff|θθ|xx] > [f|θ|x]

HSG/§2.4

Phonetic Rule Elements

[ff] > [f]
[θθ] > [θ]
[xx] > [x]

Phonetic Rule Examples

axx > ax xx > x ᴱ√aki > G. ach ✧ GL/17.3201
krexx > krex xx > x ᴱ√kerek- > G. crech ✧ GL/27.0301
uxx > ux xx > x ᴱ✶ukko > G. uch ✧ GL/74.2601
blaθθ > blaθ θθ > θ ᴱ√PALA > G. blath ✧ LT1A/Palúrien.068
gaθθ > gaθ θθ > θ ᴱ✶yatt- > G. gath¹ ✧ GL/36.7601
goθθa- > goθa- θθ > θ ᴱ✶ı̯otta > G. gôtha- ✧ GL/42.1401
heθθeglon > heθeglon θθ > θ ᴱ✶heth·thed·’lon > G. hetheglon ✧ GL/49.1201
kuiθθ > kuiθ θθ > θ ᴱ√KOYO > G. cuith ✧ LT1A/Koivië-néni.033
kweθθ > kweθ θθ > θ ᴱ√QETE > G. cweth ✧ LT2A/Tôn a Gwedrin.064
mbriθθ- > mbriθ- θθ > θ ᴱ√M(B)ṚTṚ > G. brith- ✧ QL/063.7703
-θθ > -θ θθ > θ G. -tt > G. -th ✧ GG/10.2801