Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† hăma (ama), ae, f., = ἄμη, a waterbucket, esp. for extinguishing fires, a firebucket, Plin Ep. 10, 42, 2; Juv. 14, 305; Dig. 1, 15, 3; 33, 7, 12, §§ 18, 21 (in Plaut. Mil. 3, 2, 42, false reading for aula, Lorenz ad loc.).