ˈfōnəˌlīt noun
( -s )
Etymology: French, from German phonolith, from phon- + -lith; from the fact that a slab of the fresh compact rock gives a ringing sound when struck
: a gray or green volcanic rock consisting essentially of orthoclase and nepheline — called also clinkstone
• pho·no·lit·ic | ̷ ̷ ̷ ̷|lid.ik adjective