PSl. *lě̑sъ m. ‘forest, wood(s)’. Etymology unclear: “if there is an etymological connection with OE lǣs f. 'pasture', Gsg. lǣswe , we might reconstruct * leh₁s-u-.” (RD) / OCS lěsъ Ru. les; Ukr. lis Cz. les; Slk. les; Pl. las SCr. lȉjes; Sln. lẹ̑s 'wood (material), forest', Bulg. les
Robert Farren, PIE culture words collection, 2017
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