The Collaborative International Dictionary
Leucitoid
Leucitoid \Leu"ci*toid\ (l[=u]"s[i^]*toid), n. [Leucite + -oid.] (Crystallog.) The trapezohedron or tetragonal trisoctahedron; -- so called as being the form of the mineral leucite.
Wiktionary
leucitoid
n. (context crystallography English) The trapezohedron or tetragonal trisoctahedron, the form of the mineral leucite.