A modern English variant form of aam: see AAM for etymology and earlier quots.
1502. Arnold, Chron. [see quot. 1717 under AAM.]
1852. McCulloch, Dict. Comm., 35. [In Amsterdam] the aam liquid measure = 4 ankers = 41 English wine gallons. Ibid., 649. [In Hamburg] 1 aum = 4 ankers = 32 English imperial gallons.
1863. W. Baldwin, Afr. Hunting, 369. He helped considerably to lighten our half-aum of Pontac.
