from the GNU version of the Collaborative International Dictionary of English
- n. A Dutch and German measure of liquids, varying in different cities, being at Amsterdam about 41 wine gallons, at Antwerp 361/2, at Hamburg 381/4.
from The Century Dictionary and Cyclopedia
- n. A measure of liquids used, especially for wine and oil, in Holland, Germany, Switzerland, Livonia, Esthonia, Denmark, and Sweden; a tierce.
Borrowing from Dutch aam, from German Ahm, Ohm, from Late Latin ama, from Ancient Greek ἄμη (amē, "bucket"); compare Latin hama ("water bucket"). (Wiktionary)