The Collaborative International Dictionary of English v.0.48:
cod \c.o.d.\ adj. (Commerce)
   an abbreviation of collect on delivery; payment due by the
   recipient on delivery; as, a COD parcel. [Also spelled
   COD.]
   Syn: collect, collect on delivery.
        [WordNet 1.5]
The Collaborative International Dictionary of English v.0.48:
cod \c.o.d.\ n. abbr. (Commerce)
   an abbreviation of collect on delivery; a method of payment
   by which goods are paid for when they are delivered to the
   customer's home or place of business. Contrasted to payment
   in advance or terms or credit.
   Syn: collect on delivery.
        [PJC]