ullmannite (ulmanit)

[Named after J. С. Ullmann: see Ullmannia.] A sulphid of nickel and antimony, part of the latter being frequently replaced by arsenic. It generally occurs ma ive with a granular structure, and is of a gray color with a metallic luster. Ulloa's circle. See circle of Ulloa, under circle. Ulmaceæ (ul-mā'sē-ē), n. pl. [NL. (Mirbel, 1815), ulmaceous (ul-ma's hi us), a. In bot., of or pertaining to the Ulmaceæ. Ulmeæ (ul'mē-ē), n. pl. [NL. (Lindley, 1847),