Pertaining to, or designating, any one of several
acids (known only in their salts) which contain more than one atom of
chromium.
1. Oldest; longest in duration. Shak. 2. Born or living first, or before the others, as a son, daughter, brother, etc.; first in origin. See Elder. "My lady's eldest son." Shak. Their eldest historians are of suspected credit. Bp. Stilli...