block diagram

WordReference Random House Unabridged Dictionary of American English © 2026

block′ di′agram, 

1. Computing a chart or diagram using labeled blocks connected by straight lines to represent the relationship of parts or phases, as the steps in a data-processing application. Cf. flow chart (def. 2).
2. Geology a perspective representation of the geology of an area showing surface contours and generally including two vertical cross sections.
• 1920–25

Collins Concise English Dictionary © HarperCollins Publishers::

block diagram noun

1. a diagram showing the interconnections between the parts of an industrial process
2. a diagram showing the interconnections between electronic components or parts of a program