c.1310, from O.Fr. diamant, from M.L. diamantem (nom. diamas), from V.L. *adiamantem (altered by infl. of the many Gk. words in dia-), from L. adamantem (nom. adamans) "the hardest metal," later, "diamond" (see adamant). Playing card suit is from 1594; Sense in baseball is Amer.Eng. 1875.
Registered name for interest in a trust that holds all 30 stocks included in the Dow Jones Industrial Average. Ownership of a Diamond allows an investor to track the DJIA with a single investment. Diamonds are traded on the American Stock Exchange under the symbol DIA.
[dahy-muh
nd, dahy-uh-] 