asclepias

noun
as·​cle·​pi·​as | \ ə-ˈsklē-pē-əs, a- How to pronounce asclepias (audio) \

Medical Definition of asclepias

1 capitalized : a genus (family Asclepiadaceae) of perennial herbs found chiefly in North America with flowers having a corona of five concave hoods each of which bears a slender horn — see butterfly weed, milkweed
2 : any plant of the genus Asclepias
3 : the dried root of the butterfly weed formerly used as a diaphoretic and expectorant

called also pleurisy root

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