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.
Problem: What is the difference between a System DSN, a User DSN, a File DSN, Universal Data Link (UDL), and DSN-less connection? Solution: Data source name (DSN) is a data structure that contains information about a database. The information is needed in order to connect to the database. A Universal Data Link (UDL, also known as a Microsoft Data Link) is a universal file that links to a database.