- A limestone from the Tithonian stage of the Jurassic period, quarried on the Isle of Portland, Dorset, and used extensively for building in the British Isles.
- St Paul's Cathedral and Buckingham Palace were built with Portland stone.
Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for Portland stone in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.)