a. Obs. ? slang. [f. L. altum the deep, i.e., the sea + -AL.] (See quot.)
1711. Medleys, 29 Jan. (1712), 186. His Altumal Cant, a Mark of his poor Traffick and Tar-Education.
1753. Chambers, Cycl. Supp., Altumal, a term used to denote the mercantile style, or dialect. In this sense, we meet with altumal cant, to denote the language of petty traders and tars.
