|—n , pl -ries|
|1.||any igneous rock with large crystals embedded in a finer groundmass of minerals|
|2.||obsolete a reddish-purple rock consisting of large crystals of feldspar in a finer groundmass of feldspar, hornblende, etc|
|[C14 porfurie, from Late Latin porphyrītēs, from Greek porphuritēs (lithos) purple (stone), from porphuros purple]|
Neoplatonist Greek philosopher, important both as an editor and as a biographer of the philosopher Plotinus and for his commentary on Aristotle's Categories, which set the stage for medieval developments of logic and the problem of universals. Boethius' Latin translation of the introduction (Isagoge) became a standard medieval textbook.
Learn more about Porphyry with a free trial on Britannica.com.