/ Dictionary / Index B butterfly weed: Meaning and Definition of Find definitions for: but'terfly weed" Pronunciation: [key] Also calleda North American milkweed, Asclepias tuberosa, having clusters of bright orange flowers. an erect North American plant, Gaura coccinea, of the evening primrose family, having wandlike spikes of white to pink flowers turning red with age. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. butterfly wedge butter knife 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