bidentate

In chemistry, a ligand is an atom, ion, or molecule (see also: functional group) that generally donates one or more of its electrons through a coordinate covalent bond to, or shares its electrons through a covalent bond with, one or more central atoms or ions (these ligands act as a Lewis base). Fewer examples exist where a molecule can be described as a ligand that does not accept electrons from a Lewis base (hence, the ligand acts as a Lewis acid).
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Adjective
1. having toothlike projections that are themselves toothed
(similar) rough

(a.)
Having two teeth or two toothlike processes; two-toothed.
  

 Say it 
A ligand that has two "teeth" or atoms that coordinate directly to the central atom in a complex. For example, 1,10-phenanthroline is a bidentate ligand of iron.

B: (Kimia) bidentat
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