a unit of mass equal to one thousand daltons or approximately 1.65 × 10−21 grams.

A unit of mass equal to 1,000 daltons. A dalton is a unit used to measure the mass of atoms and molecules. One dalton equals the atomic weight of a hydrogen atom (1.66 x 10 -24 grams).

(kDa)  A unit of atomic mass equal to 1 000 daltons. See  dalton.