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pentagraph
noun
pen·ta·graph
\ˈpentəˌgraf, -rȧf\
Definition of pentagraph
: a cluster of five successive letters
pentagraphic
adjectivepentagraphically
\-fə̇k(ə)lē\ adverbFrom the M-W Editors
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Origin and Etymology of pentagraph
penta- + -graph
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