d's

noun pl. d's, D's

1. the fourth letter of the English alphabet: from the Greek delta, a borrowing from the Phoenician
2. any of the speech sounds that this letter represents, as, in English, the (d) of dog
3. a type or impression for d or D
4. the fourth in a sequence or group
5. an object shaped like

adjective

1. of d or D
2. fourth in a sequence or group
3. shaped like