/ Dictionary / Index P pycnium: Meaning and Definition of Find definitions for: pyc•ni•um Pronunciation: (pik'nē-um), [key] — pl. -ni•a a flask-shaped or conical sporangium of a rust fungus, which develops below the epidermis of the host and bears pycniospores. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pycniospore pycno- Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language