/ Dictionary / Index P prothalamion: Meaning and Definition of Find definitions for: pro•tha•la•mi•on Pronunciation: (prō"thu-lā'mē-on", -un), [key] — pl. -mi•a a song or poem written to celebrate a marriage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: prothalamion (Thesaurus) Proteus prothalamium Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language