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There are 5 twelve-letter words containing RIONI

DIPRIONIDIANdiprionidian adj. (Paleontology, of a graptolite) Having a polyparium with a row of cells on each side.
DIPRIONIDIAN adj. of graptolites, serrated on both sides.
HISTRIONICALhistrionical adj. (Britain) Alternative form of histrionic.
HISTRIONICAL adj. relating to the stage or actors, also HISTRIONIC.
HISTRIONISMShistrionisms n. Plural of histrionism.
HISTRIONISM n. acting, theatricality, also HISTRIONICISM.
TENEBRIONIDStenebrionids n. Plural of tenebrionid.
TENEBRIONID n. a dark-coloured nocturnal beetle.
ZWITTERIONICzwitterionic adj. Of or pertaining to a zwitterion.
ZWITTERIONIC adj. of or like a zwitterion, an ion carrying both a positive and negative charge.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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