stey-

“to be stiff, compressed, stone”

Widely acceptedmaterialrigidity

Source of English stone, stiff, German Stein

Root for stiffness/stone, yielding English stone, stiff, German Stein, possibly English steel.

bʰerdʰ-“to cut, split, separate”bʰerǵ-s-“to protect by enclosing”bʰreg-mn̥“that which breaks, fragment”deru-“tree, wood, to be firm”doru-mn̥-“beam, timber, spear-shaft”dʰeyǵʰ-mn̥-₂“wall, thing built from clay”dʰrew-“to be firm, to be solid”gʰel-mn̥-“a shining, gleam, golden thing”