dot matrix printer; matrix printer
Computing term for a printer that forms characters and graphics from a matrix of dots.
Dot matrix printers were once widely used in offices.
More common and casual term for a dot matrix printer; ドット印字装置 is a more formal, technical compound.
Compound of ドット (dot) + 印字 (printing) + 装置 (device), a direct calque of English 'dot matrix printer'.