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.
The DSN Telephone Directory is presented as a single global directory as well as divided into eight geographical subdirectories: 1  Africa. 2  Alaska. 3  Australia. Canada.  Contiguous United States 1  (CONUS) Europe. 2  Pacific. Central.