† pyramido-prismaticadj.
Origin: Formed within English, by compounding. Etymons: pyramid n., -o- connective, prismatic adj.
Etymology: < pyramid n. + -o- connective + prismatic adj.
Mineralogy.
Obsolete.
rare.
1821 R. Jameson 165 Pyramido-Prismatic Augite.
1839 XIV. 684/2 Baryte. 1. Pyramido-prismatic baryte, or strontianite.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online June 2018).