read-only memory

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

• noun ROM.

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

• noun computing a computer memory chip that stores values but does not allow updates, in which the values are nonvolatile in that they are retained even when the computer is unpowered

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

• noun (computer science) memory whose contents can be accessed and read but cannot be changed