Tolkien introduced the root ᴹ√MITH in The Etymologies of the 1930s as a blending of ᴹ√MIS “✱wet” and ᴹ√KHITH “mist, fog”, with the derivative N. mith “white fog, wet mist” as in N. Mithrim “✱Mist Lake” (Ety/MITH, RINGI; EtyAC/MITH). As a later addition to this entry Tolkien wrote the adjective N. mith “grey”, and that was the more common use of this word in Tolkien’s later writings. In a 1955 letter to David Masson Tolkien specified that “usage suggests that MIÞ- is paler and whiter, a luminous grey” (PE17/72).
Primitive elvish
lassē
noun. leaf
las
root. leaf
mith
root. grey
slas
root. ear
slas
noun. ear
stin
root. grey
thindi
adjective. grey
thindā
adjective. grey
thini
adjective. grey
This root was connected to leaves throughout Tolkien’s life. It did not appear directly in the Qenya or Gnomish lexicons of the 1910s, but ✱ᴱ√LASA “leaf” is implied by ᴱQ. lasse and G. lass “leaf” (QL/51; GL/52). ᴹ√LAS appeared directly in The Etymologies of the 1930s with the derivatives ᴹQ. lasse and N. lhass (Ety/LAS¹), and the root √LAS “leaf” was also mentioned in Tolkien’s later writings (PE17/77; VT39/9).