Feminine passive participle of 'arach (in the sense of appointing); a ration of food -- allowance, diet, dinner, victuals.
see HEBREW 'arach
אֲרֻחָה noun feminine meal, allowance (of food) absolute Jeremiah 40:5; construct יָרָק אֲרֻחַת Proverbs 15:17 a portion of herbs, i.e. a slender meal; elsewhere of allowance given to captive king Jehoiachin, ׳א תָּמִיד a continual allowance 2 Kings 25:30 = Jeremiah 52:34; אֲרֻחָתוֺ ib. = id.