/sel"euhn duyn', -deen'/ , n.
1. Also called greater celandine, swallowwort . an Old World plant, Chelidonium majus, of the poppy family, having yellow flowers.
2. Also called lesser celandine . an Old World plant, Ranunculus ficaria, of the buttercup family, having fleshy, heart-shaped leaves and solitary yellow flowers.
[ 1275-1325; ME selandyne, var. of celydon chelidonia greater celandine, chelidonium lesser celandine chelidónion, deriv. of chelidón swallow; said to be so called because it blooms when the swallows return in spring ]