A word appearing as G. thin- “skim” in the Gnomish Lexicon of the 1910s along with a variant thinta-, both clearly related to the noun G. thim “milk, after separation” (GL/71-72).

Neo-Sindarin: These 1910s verbs conflict with the later root √THIN “grey” and the verb [N.] thinna- “fade” from ON. thintha-. As such, I adapt this verb as ᴺS. thiv- “to skim” based on a Neo-Root ᴺ√THIM which I used to justify the retention of ᴺS. thim for “milk”.