Early Quenya
mulda
adjective. powdery
mulina
adjective. powdery
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A word with variant forms ᴱQ. mulda and mulina and the gloss “powdery” from the Qenya Lexicon of the 1910s, an adjectival form of ᴱQ. mul (muld-) “fine powder”, ultimately derived from the early root ᴱ√MULU “grind (fine)” (QL/63).
Neo-Quenya: In notes from the late 1950s or early 1960s, Tolkien gave Q. mulë for “meal” = “✱coarsely ground flour”, so it seems ✱√MUL “grind” either survived or was restored. This may make it possible to retain ᴺQ. mulda “powdery” for purposes of Neo-Eldarin as descriptive of ground up things.