בּוּץ‎ (bûwts|boots|noun|masculine|byssus)
[Heb] בּוּץ‎ ETCBC: בּוּץ‎ (subs|byssus) OSHL: b.au.ac TWOT: 219 GK: H1009 Greek: βύσσινος, βύσσος
Derivation: from an unused root (of the same form) meaning to bleach, i.e. (intransitive) be white;
Strong's: probably cotton (of some sort)
KJV: fine (white) linen.