1. 1  any of several threadlike bodies, consisting of chromatin, that carry the genes in a linear order: the human species has 23 pairs, designated 1 to 22 in order of decreasing size and X and Y for the female and male sex chromosomes respectively.
data source name (DSN) A data source name (DSN) is a data structure that contains the information about a specific database that an Open Database Connectivity ( ODBC ) driver needs in order to connect to it.
DSN replaced the older Autovon system. The DSN consists of four subsystems: Switching, Transmission, Timing and Synchronization, and; Network Administration and Management. The DSN Switching Subsystem consists of multifunction, stand-alone tandem, end office, and remote switching units.