typewriter

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

• noun A writing machine that produces characters similar to typeset print by means of a manually operated keyboard that actuates a set of raised types, which strike the paper through an inked ribbon.
• noun Printing A typestyle like that of typewritten copy.

from The Century Dictionary.

• noun A machine for mechanical writing, operated by hand, and printing one letter, or combination of letters, at a time, by the impress of type adapted to the purpose. There are now several distinct types of these machines.
• noun An operator on a typewriting machine; one who prints characters on paper by means of a type-writer.

from the GNU version of the Collaborative International Dictionary of English.

• noun An instrument for writing by means of type, a typewheel, or the like, in which the operator makes use of a sort of keyboard, in order to obtain printed impressions of the characters upon paper.
• noun One who uses such an instrument.

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

• noun A device, at least partially mechanical, used to print text by pressing keys that cause type to be impressed through an inked ribbon onto paper.
• noun archaic One who uses a typewriter; a typist.

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

• noun hand-operated character printer for printing written messages one character at a time