silkweed n 1: any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts [syn: {milkweed}, {silkweed}]
Silkweed \Silk"weed`\, n. (Bot.) Any plant of the genera {Asclepias} and {Acerates} whose seed vessels contain a long, silky down; milkweed. [1913 Webster]