Definition of porphyry shell
: an olive shell (Oliva porphyria) having a dark-red or brown polished surface with light spots
Join MWU now and get access to America’s largest dictionary, with:
- 300,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up porphyry shell? Please tell us where you read or heard it (including the quote, if possible).