Ilk. [o] or [u] usually developed between a consonant and final [l], [r], [n], [m]; [-Cm|-Cn{lrn}|-rn] > [-Cum|-Co{lrn}|-rn]

Ilk. [o] or [u] usually developed between a consonant and final [l], [r], [n], [m]; [-Cm|-Cn{lrn}|-rn] > [-Cum|-Co{lrn}|-rn]

There are numerous examples in the Etymology where a final [l], [r], [n], [m] became syllabic after another consonant and developed an intervening vowel. This vowel was [o] in most cases, but was [u] in the case of final [m]: ᴹ✶khithme > Dor. hidhum (EtyAC/KHIS).

It seems this change did not occur for certain favored combinations, where which retained. There are several examples in which final [-rn] did not develop a vowel, such as Dor. dorn or Ilk. arn (Ety/DÓRON, YAR). There is one case in which final [-lm] did not develop a vowel: Ilk. lalm (Ety/ÁLAM), but another where it did: Ilk. talum (Ety/TAL). The two examples are very similar, so they may represent some uncertainly on Tolkien’s part on the development of final [-lm] in Ilkorin.

Phonetic Rule Elements

[-Cm] > [-Cum]
[-Cn] > [-Con]
[-Cl] > [-Col]
[-Cr] > [-Cor]
[-lm] > [-lm]
[-rn] > [-rn]

Phonetic Rule Examples

legl > legol -Cl > -Col ᴹ√LEK > Ilk. legol ✧ Ety/LEK
naugl > naugol -Cl > -Col ᴹ√NÁWAK > Dor. naugol ✧ Ety/NAUK
taŋgl > taŋgol -Cl > -Col ᴹ✶tankla > Ilk. tangol ✧ Ety/TAK
uŋgl > uŋgol -Cl > -Col ᴹ√UÑG > Ilk. ungol ✧ Ety/UÑG
aðm > aðum -Cm > -Cum ᴹ✶yatmā > Dor. aðum ✧ EtyAC/YAT
hiðm > hiðum -Cm > -Cum ᴹ✶khithme > Dor. hiðum ✧ EtyAC/KHIS
talm > talum -Cm > -Cum ᴹ√TALAM > Ilk. talum ✧ Ety/TAL
nivn > nivon -Cn > -Con ᴹ√NIB > Dor. nivon ✧ Ety/NIB
tovn > tovon -Cn > -Con ᴹ✶tubnā > Ilk. tovon ✧ Ety/TUB
θavn > θavon -Cn > -Con ᴹ✶stabnō > Ilk. thavon ✧ Ety/STAB
uduvn > uduvon -Cn > -Con ᴹ✶Utubnu > Ilk. Uduvon ✧ Ety/TUB
kwindr > kwindor -Cr > -Cor ᴹ✶kwentrō > Dor. cwindor ✧ Ety/KWET
uŋgr > uŋgor -Cr > -Cor ᴹ√UÑG > Ilk. ungor ✧ Ety/UÑG
lalm > lalm -lm > -lm ᴹ√ÁLAM > Ilk. lalm ✧ Ety/ÁLAM
arn > arn -rn > -rn ᴹ√YAR > Ilk. arn ✧ Ety/YAR
dorn > dorn -rn > -rn ᴹ√DÓRON > Dor. dorn ✧ Ety/DÓRON
θorn > θorn -rn > -rn ᴹ√THÓRON > Ilk. thorn ✧ Ety/THOR