/ Dictionary / Index S superphylum: Meaning and Definition of Find definitions for: su•per•phy•lum Pronunciation: (s'pur-fī"lum), [key] — pl. -la a category of related phyla within a kingdom. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: superphylum (Thesaurus) superphosphate superphysical Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language