1) the purple fish, a species of shell fish or mussel
2) a fabric coloured with purple dye, a garment made from purple cloth
Part of Speech: noun feminine
Of Latin origin; the "purple" mussel, that is, (by implication) the red blue color itself, and finally, a garment dyed with it: - purple.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root πορφύρα; click on the second column to search for that grammatical form of the root πορφύρα; click on the third column to search for that word and grammatical form; click on the total to search for the root πορφύρα.