line printer

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A high-speed printing device that prints an entire line of type at one time.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun computing A high-speed impact printer, most often used by older mainframes, that prints an entire line in a single operation

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun printer that serves as an output device on a computer; prints a whole line of characters at a time