Apparently from the same root as Ziv (in the sense of prominence); an angle (as projecting), i.e. (by implication) a corner-column (or anta) -- corner(stone).
see HEBREW Ziv
H2106. zavith
[זָוִית] noun feminine corner (late (Aramaic זָוִיתָא, (often for Hebrew מִקְצוֺעַ מִּנָּה,), hence, as loan-word (FräAramaic Fremdw. 11, 168) Arabic ); — Plural absolute זָוִיּוֺת Psalm 144:12; construct זָוִיֹּת Zechariah 9:15; — מִוְבֵּךְַ כְּזָוִיֹּת כַמִּזְרָק וּמָֽלְאוּ 9:15 simil. of warriors streaming with blood, see Leviticus 1:5, 11 etc.; ׳וגו כְּז ׳בְּנוֺתֵינוּ Psalm 144:12 out daughters like corner (-pillar)s, carved (so Che and others, but see II. חטב) in palace-fashion.