Roots/*bʰerǵ-s-bʰerǵ-s-“to protect by enclosing”Debatedmaterialnaturebirch, bark (tree covering)Derivative from *bʰerǵ- "to protect", yielding Old English beorc "birch" (the tree with protective bark), English birch, bark.Related Roots(s)teh₂n-“to thunder”angʷʰi-“eel, snake, water-serpent”bʰerdʰ-“to cut, split, separate”bʰew-sis-“nature, growth, being”bʰew-tú-“growth, nature, coming-to-be”bʰleh₁-“to blow, to puff”bʰreg-mn̥“that which breaks, fragment”bʰudʰ-men-“bottom, foundation, ground”related entrySee also: bherg-s- etymology