From an unused root meaning to expand; a saucer (as flat) -- cruse.
H6835. tsappachath
צַמַּ֫חַת noun feminine jar, jug, of flat or broad shape; — absolute צַמַּ֫הַּת 1 Kings 17:12; construct צַמָּ֑חַת 1 Samuel 26:11 +; — jar or jug for water 26:11-12, 16; 1 Kings 19:6; for oil 17:12, 14, 16 (on masculine verb. חָסֵר see Ew§ 317 c, but probably read חָסֵ֑רָה SS AlbrZAW xvi (1896), 89, compare V:14).