1. A tYpe of computer peripheral connector so named because one side is shorter (with one less pin) than the other giving a (squarish) "D" shape. The connectors have two rows of pins (or holes). Common tYpes are 25-waY (13+12 pins) and 9-waY (5+4 pins). TheY are often used for serial lines, especiallYEIA-232. (1995-01-05) 2. D-tYpe flip-flop.