שֵׁשׁ (shêshshayshnoun|masculinealabaster|byssus)
[Heb] שֵׁשׁ ETCBC: שֵׁשׁ‎ (subs|linen), שֵׁשׁ‎ (subs|alabaster) OSHL: v.cw.ab, v.gg.af TWOT: 2473 2379a GK: H9253, H9254 Greek: βύσσινος, βύσσος, λίθινος, μυριάς
Derivation: or (for alliteration with מֶשִׁי) שְׁשִׁי; for שַׁיִשׁ;
Strong's: bleached stuff, i.e. white linen or (by analogy) marble
KJV: [idiom] blue, fine (twined) linen, marble, silk.