Quenya 

lassë

leaf

lassë noun "leaf"; pl. lassi is attested (Nam, RGEO:66, Letters:283, LAS1, LT1:254, VT39:9, Narqelion); gen. lassëo "of a leaf", gen. pl. lassion "of leaves" (earlier lassio) (WJ:407). The word lassë was only applied to certain kinds of leaves, especially those of trees (PE17:62), perhaps particularly _ear-shaped _leaves (cf. the entry _LAS1 _in the Etymologies, where Tolkien comments on the pointed or leaf-shaped Elvish ears and suggests an etymological connection between words for "ear" and "leaf"); see also linquë #3. Compound lasselanta "leaf-fall", used (as was quellë) for the latter part of autumn and the beginning of winter (Appendix D, Letters:428); hence Lasselanta alternative name of October (PM:135). Cf. also lassemista "leaf-grey, grey-leaved" (LotR2:III ch. 4, translated in Letters:224, PE17:62), lassewinta a variant of lasselanta (PM:376). Adj. laicalassë "green as leaves" (PE17:56). See also lillassëa, lantalasselingëa.