The same as pachad; a testicle (as a cause of shame akin to fear) -- stone.
see HEBREW pachad
H6344. pachad
II. [מַּ֫הַד] noun [masculine] thigh (probably loan-word (through Aramaic, otherwise = ז) from Arabic thigh and (compare WeGGN, 1893, 479) sub-tribe, Palmyrene פחד tribe); — פַחְדּוֺ גִּידֵי Job 40:17 Kt the sinews of his thigh (Qr מְּחָדָיו), of hippopotamus.