/ Dictionary / Index S siphono-: Meaning and Definition of Find definitions for: siphono- Pronunciation: [key] a combining form meaning “tube,” “siphon,” used in the formation of compound words: siphonostele. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. siphon bottle siphonophore Related Content Daily Word Quiz: supine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language