a battery-powered microcomputer small enough to fit in the palm.

1985–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Computing Dictionary

palmtop definition

(Or "pocket computer", "Hand-held Personal Computer", H/PC) A small general-purpose, programmable, battery-powered computer cabable of handling both numbers and text (in contrast to most pocket calculators) which can be operated comfortably while held in one hand. A palmtop is usually loaded with an operating system such as Windows CE. Data can be transferred between the palmtop and a desktop PC.
A palmtop is very similar to a Personal Digital Assistant though a palmptop may have a larger keyboard and more RAM and is possibly more general purpose in concept, if not in practise.
The Psion Organiser is one of the best known examples. [Was it the first?]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Portable satellite radio is a palmtop cornucopia of music.
Data were recorded on palmtop computers in the field.
Participants completed research interviews, self-report measures, and were trained to use a palmtop computers.
Data are retrieved using a notebook or palmtop computer.
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