/luy"geuhnd, lig"euhnd/ , n.
1. Biochem. a molecule, as an antibody, hormone, or drug, that binds to a receptor.
2. Chem. a molecule, ion, or atom that is bonded to the central metal atom of a coordination compound. Cf. complexing agent .
[ 1945-50; ligandus, ger. of ligare to bind, tie ]