/ Dictionary / Index B botulinus: Meaning and Definition of Find definitions for: bot•u•li•nus Pronunciation: (boch"u-lī'nus), [key] — pl. -nus•es. a soil bacterium, Clostridium botulinum, that thrives and forms botulin under anaerobic conditions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: botulinus (Thesaurus) botulin botulism Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language