n. The European herb Cynanchum (Asclepias) Vincetoxicum, or white swallowwort, the plant anciently called asclepias. Also called vincetoxicum (which see) and tame-poison.n. Hence, as a book-name, any plant of the genus Asclepias, the milkweed: applied also to the soma-plant, as formerly classed in Asclepias, and to an umbellifer, Elæoselinum (Thapsia) Asclepium, perhaps from its external resemblance to an asclepiad.n. The celandine, Chelidonium majus, once fancied to be used by swallows as a sight-restorer. Compare swallow-stone.