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 is the Defense Switched Network, a telephone network specifically for the use of the U.S. military worldwide. The DSN uses its own internal numbering system, consisting of a 3-digit area code and 7-digit number.