@@@ tîw (Ety/TEK) appears to be plural, but is clearly glossed as singular “letter” with primitive form tekmē
Noldorin
tî
noun. line, row, line, row; [G.] straight
tî
noun. line, row
tîr
adjective. straight, right, straight, right; [G.] upright, honest; esteem, regard, honour
tîr
adjective. straight, right
tîw
noun. letter
tint
noun. spark
tir-
verb. to watch
tiria-
verb. to watch
tint
noun. spark
tinw
noun. spark, small star
taur
noun. king (only used of the legitimate kings of whole tribes)
tew
noun. letter
taer
adjective. straight
Written tær (with ae-ligature) in the Etymologies, rectified here according to VT/46:18 (which also lists the ligature)
i
article. the
lhîr
noun. row
dínen
adjective. silent
taer
adjective. straight
aran
noun. king (used of a lord or king of a specified region)
feir
noun. right (hand)
forgam
adjective. right-handed
forn
noun. right, north
fœir
noun. right (hand)
gammas
noun. s-sign (special sign used to mark a final -s in Tengwar)
gildin
noun. silver spark
i
definite article. the
i
definite article. who
lhîr
noun. row, range
othlon
noun. paved way
othlond
noun. paved way
rada-
verb. to make a way, find a way
tê
noun. line, way
âr
noun. king (used of a lord or king of a specified region)
âr
noun. king
In LotR/IV:IV, Frodo is called Daur, which might be the mutated form of this word