1. <hardware> 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, especially EIA-232.
2. D-type flip-flop.
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Nearby terms: DTR « DTS « DTSS « D-type » D-type flip-flop » du » DUA