A computer that is small enough to fit in the palm of one's hand.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "palmtop" in a sentence
"The two can communicate wirelessly, but more interestingly they can be coupled such that "there is minimal increase to the overall size and weight" of the palmtop -- in other words, the "phone" bit isn't particularly large, making it more comfortable to hold up to your face in a conversation than your"
" Handheld computer that is also known as a palmtop computer."
"A personal digital assistant (PDA) is a mobile device, also known as a palmtop computer."