Early Noldorin
madren
adjective. edible
mad-
verb. to eat
medid
adjective. edible
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.
An adjective appearing as ᴱN. madren “edible” in Early Noldorin Word-lists of the 1920s based on the verb ᴱN. mad- “eat” (PE13/163, 165). It seems this was a pure adjective, as opposed to indeclinable ᴱN. medid “edible” which was based on the inflected verb form medi- (PE13/163, 165). In the Gnomish Lexicon of the 1910s the adjective was instead G. madrin “edible, fit for food, wholesome” with variant form madriol (GL/56).
Neo-Sindarin: For purposes of Neo-Sindarin I would update this to ᴺS. madui “edible” using the later adjective suffix -ui, as in únodui “uncountable” (PE17/144).