(?i thloss or ?i loss [the lenition product of lh is uncertain], construct lhos), pl. lhyss (?i lyss). – Suggested Sindarin form of ”Noldorin” thloss, floss.
Quenya
lussa-
to whisper
tiquilin
noun. thaw, melting snow, slush
tiquilindëa
adjective. thawing, slushy
lussa- vb. "to whisper" (SLUS/SRUS). Since Tolkien eventually decided that roots in sl- yield Quenya words in hl- (though this was pronounced l- in late Exilic Quenya), it may be that the spelling *hlussa- is to be preferred.