ligand
/ˈlɪgənd/noun
1- Chemistry an ion or molecule attached to a metal atom by coordinate bonding【化】配位体。
1.1
- Biochemistry a molecule that binds to another (usually larger) molecule【生化】配（位）体, 配基。
词源
1950s: from Latin ligandus 'that can be tied'， gerundive of ligare 'to bind'.