1A small or microscopic channel. Especially in "microchannel plate" noun Electronics a fibre-optical plate with microscopic channels through which light may travel, used to amplify an optical image.
Usually in form Micro Channel. A type of high-speed bus architecture introduced in 1987 in certain models of IBM computers, which allows more than one bus master (or central processing unit) to be used in a single computer. Chiefly attributive. [A trademark in the United States.].
1950s; earliest use found in Ecology. From micro- + channel.