Feminine of ycud; a foundation -- foundation.
see HEBREW ycud
H3248. yesudah
יְסוּדָה noun feminine foundation = city founded; בְּהַרֲרֵיקִֿדֶשׁ יְסוּדָתוֺ Psalm 87:1 ("" י ׳אֹהֵב צִיּוֺן שַׁעֲרֵי).