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).
1) corner Part of Speech: noun feminine plural A Related Word by BDB/Strong’s Number: apparently from the same root as H2099 (in the sense of prominence) Same Word by TWOT Number: 534a
Brown-Driver-Briggs
[זָוִית] noun femininecorner (late (Aramaic זָוִיתָא, (often for Hebrew מִּנָּה, מִקְצוֺעַ), hence, as loan-word (FräAramaic Fremdw. 11, 168) Arabic ); — Plural absolute זָוִיּוֺתPsalm 144:12; construct זָוִיֹּתZechariah 9:15; — וּמָֽלְאוּ כַמִּזְרָק כְּזָוִיֹּת מִוְבֵּךְַZechariah 9:15 simil. of warriors streaming with blood, see Leviticus 1:5,11 etc.; ׳בְּנוֺתֵינוּ כְּז׳וגוPsalm 144:12out daughters like corner (-pillar)s, carved (so Che and others, but see II. חטב) in palace-fashion.
Psalm 144:12 HEB:בִּֽנְעוּרֵ֫יהֶ֥ם בְּנוֹתֵ֥ינוּ כְזָוִיֹּ֑ת מְ֝חֻטָּב֗וֹת תַּבְנִ֥ית NAS: And our daughters as corner pillars fashioned KJV: [that] our daughters [may be] as corner stones, polished INT: their youth and our daughters corner fashioned the similitude
Zechariah 9:15 HEB:וּמָֽלְאוּ֙ כַּמִּזְרָ֔ק כְּזָוִיּ֖וֹת מִזְבֵּֽחַ׃ NAS: like a [sacrificial] basin, [Drenched] like the corners of the altar. KJV: like bowls, [and] as the corners of the altar. INT: will be filled A basin the corners of the altar