From chatsah; the middle (of the night) -- mid(-night).
see HEBREW chatsah
H2676. chatsoth
[חָצוֺת] noun feminine (Infinitive form.) division, middle — only construct הַלַּיְלָה חֲצֹת Exodus 11:4 (J) = midnight; לַיְלָה חֲצוֺת Job 34:20; Psalm 119:62; in all = adverb. phrase of time (בְּ omitted)