From an unused root (of the same form) meaning to bleach, i.e. (intransitive) be white; probably cotton (of some sort) -- fine (white) linen.
H948. buts
בֻּץ בּוּץ, noun [masculine] byssus (late), (Phoenician בוץ, Aramaic בּוּץ, ; √ dubious; Birch, WilkinsonEgyptians ii. 158 f. from Egyptian hbos,, clothe; see Say. Herodotii. 86; Thes from √ בוץ, but NöZMG 1875, 650; Armen., according to LagSemitic i. 72 and others) a fine white Egyptian linen, and cloth made of it, הַבֻּץ בֵּיתעֲֿבֹדַת מִשְׁמְּחוֺת 1 Chronicles 4:21 families of the house of byssus-working; compare 2 Chronicles 2:13; בּוּץ בִּמְעִיל מְכֻרְבָּל 1 Chronicles 15:27 clothed in a robe of byssus (but read rather as "" 2 Samuel 6:14 בְּכָלעֹֿז מְכַרְכֵּר was dancing with all his might); compare בּ ׳תַּכְרִיךְ Esther 8:15; בּוּץ מְלֻבָּשִׁים2 Chronicles 5:12; בוּץ חַבְלֵי Esther 1:6; 2 Chronicles 3:14 material of מָּרֹכֶת; article of trade Ezekiel 27:16 (strike out ᵐ5 Co). compare also שֵׁשׁ.
בוק (= בקק).