ˈlamprəˌfī(ə)r noun
( -s )
Etymology: International Scientific Vocabulary lampro- + -phyre; originally formed as German lamprophyr
: any of a series of dark rocks of basaltic habit that resemble trap, occur usually in narrow dikes, and sometimes contain glittering plates of biotite
• lam·pro·phyric | ̷ ̷ ̷ ̷|firik, -fīr- adjective