Synonyms of 'hand-held'
portableDictionary, pocket, mini
keying in the details on a hand-held computer
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Miniature is used to describe something which is very small, especially a smaller version of something which is normally much bigger.
The farm has been selling miniature roses since 1979.
Thesaurus for hand-held from the Collins English Thesaurus
A hand-held device such as a camera or a computer is small and light enough to be used while you are holding it.