Early Quenya
tiqilin
noun. thaw, melting snow, slush
tiqilindea
adjective. thawing, slushy
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
This word appeared as ᴱQ. tiqilin “a thaw, melting snow, slush” with stem form tiqilind- as an elaboration of ᴱQ. tiqile “melting, thawing, thaw” (QL/92).
Neo-Quenya: I think this word can be salvaged as ᴺQ. tiquilin, but I would revise its etymology to be a combination of ᴺQ. tiqu- “melt” and √LIN “pool”.