A word in The Etymologies of the 1930s glossed “mast” (EtyAC/NEL) related to Ilk. breth “beech-mast”, both derived from the root ᴹ√BERETH “beech” (Ety/BERETH). This word may be the same in both Noldorin and Ilkorin given N. Brethil and N. Brethorn (Ety/NEL; EtyAC/NEL). While breth conceivably could refer to the mast of a ship, it more likely refers to the fallen nuts and acorns of beech, oak and chestnut trees used in ancient times to feed pigs, so “✱fallen nuts or acorns”, one of the senses of the Old English word “mæst”.
Conceptual Development: The Gnomish Lexicon of the 1910s had G. delmos “beech nuts, mast” likewise related to G. deldron “beech” (GL/30); the second element in this Gnomish word might be G. môs “food”. G. delmos also appeared (unglossed) in the Gnomish Lexicon Slip (PE13/112).
The passive participle of the verb N. dant- “fall” in The Etymologies of the 1930s under the root ᴹ√DA(N)T (Ety/DAT).
Neo-Sindarin: The later Sindarin form of the verb is danna- whose passive participle would ordinarily be dannannen; compare covannen the passive participle of cova- (PE17/158). But I think dannen “fallen” may remain viable as a reduction of dannannen. Another possibility is ✱dannan; compare the archaic passive participle of †covan(n) of cova- (PE17/158).