יָרֵךְ yârêk (H3409)

the thigh (from its fleshy softness); by euphemistically the generative parts; figuratively, a shank, flank, side

1) thigh, side, loin, base 1a) thigh 1a1) outside of thigh (where sword was worn) 1a2) loins (as the seat of procreative power) 1b) side (flank) (of object) 1c) base

from an unused root meaning to be soft;