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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